Dido Harding, Executive Chair of NHS Test and Trace and Britain's Health Secretary Matt Hancock leave Downing Street in London, Britain December 10, 2020. REUTERS/Simon Dawson

Dido Harding, Executive Chair of NHS Test and Trace, makes her way, following the spread of the coronavirus disease (COVID-19), in Westminster, London, Britain November 10, 2020. REUTERS/John Sibley

Dido Harding, Executive Chair of NHS Test and Trace, makes her way, following the spread of the coronavirus disease (COVID-19), in Westminster, London, Britain November 10, 2020. REUTERS/John Sibley

Dido Harding, Executive Chair of NHS Test and Trace, makes her way, following the spread of the coronavirus disease (COVID-19), in Westminster, London, Britain November 10, 2020. REUTERS/John Sibley

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Hannah McKay

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Henry Nicholls

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Henry Nicholls

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Henry Nicholls

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Henry Nicholls

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Henry Nicholls

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Hannah McKay

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Hannah McKay

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Hannah McKay

Dido Harding, Executive Chair of NHS Test and Trace walks down the street amid the outbreak of the coronavirus disease (COVID-19), in Westminster, London, Britain September 17, 2020. REUTERS/Hannah McKay

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY)

German choreographer Sasha Waltz is pictured after a dress rehearsal of Henry Purcell's "Dido and Aeneas", which she choreographed, in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY IMAGES OF THE DAY)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: ENTERTAINMENT)

Dancers perform during a dress rehearsal of Henry Purcell's "Dido and Aeneas" by German choreographer Sasha Waltz in Berlin August 25, 2011. The performance will be shown to the public on August 27 at the Waldbuehne in the German capital. REUTERS/Tobias Schwarz (GERMANY - Tags: SOCIETY IMAGES OF THE DAY)

A member of the Mark Morris Dance Group performs in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris conducts the orchestra, choir and dancers in a rehearsal for the Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A members of the Mark Morris Dance Group dances in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris (bottom) conducts the orchestra, choir and dancers in a rehearsal for the Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Members of the Mark Morris Dance Group dance in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Members of the Mark Morris Dance Group dance in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A members of the Mark Morris Dance Group dances in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris Dance Group dancer Amber Darragh practices for her role in "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Members of the Mark Morris Dance Group dance in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Dancers from the Mark Morris Dance Group perform above the orchestra and choir from Emmanuel Music during a rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Members of the Mark Morris Dance Group dance in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Craig Biesecker dances the role of Aeneas in the Mark Morris Dance Group's dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Members of the Mark Morris Dance Group dance in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Members of the Mark Morris Dance Group dance in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Members of the Mark Morris Dance Group dance in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris (lower left) conducts the orchestra, choir and dancers in a rehearsal for the Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris conducts the orchestra, choir and dancers in a rehearsal for the Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the Company's most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Emmanuel Music musicians rehearse for Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris Dance Group dancers Craig Biesecker (L) and Amber Darragh rehearse their roles in "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A member of the Mark Morris Dance Group performs in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris conducts the orchestra, choir and dancers in a rehearsal for the Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris Dance Group dancers Craig Biesecker (L) and Amber Darragh rehearse their roles in "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A member of the Mark Morris Dance Group performs in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Emmanuel Music musicians rehearse for Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the Company's most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A member of the Mark Morris Dance Group performs in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A member of the Mark Morris Dance Group performs in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Emmanuel Music musicians rehearse for Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the Company's most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A member of the Mark Morris Dance Group performs in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Choreographer, dancer and conductor Mark Morris prepares for a rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A member of the Mark Morris Dance Group performs in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris (R) conducts the orchestra, choir and dancers in a rehearsal for the Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris Dance Group dancer Craig Biesecker rehearses his role in "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

A member of the Mark Morris Dance Group performs in a dress rehearsal of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the Company's most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Mark Morris (C) prepares for the Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)

Emmanuel Music musicians rehearse for Mark Morris Dance Group's performances of "Dido and Aeneas" at the Cutler Majestic Theater in Boston, Massachusetts May 27, 2008. "Dido and Aeneas", featuring choreography by Mark Morris and music by English composer Henry Purcell, premiered in 1989 in Brussels and is one of the CompanyÕs most well-known and acclaimed works. REUTERS/Brian Snyder (UNITED STATES)