A Passenger wearing a protective face mask arrives at St Pancras Eurostar station in London, On the first day that it has become compulsory to wear a face mask when travelling on Eurostar trains to France and Belgium, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 4, 2020. REUTERS/Toby Melville

Passengers wearing protective face masks are seen at St Pancras Eurostar station in London, On the first day that it has become compulsory to wear a face mask when travelling on Eurostar trains to France and Belgium, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 4, 2020. REUTERS/Toby Melville

Passengers wearing protective face masks are seen at St Pancras Eurostar station in London, On the first day that it has become compulsory to wear a face mask when travelling on Eurostar trains to France and Belgium, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 4, 2020. REUTERS/Toby Melville

Passengers wearing protective face masks queue at St Pancras Eurostar station in London, On the first day that it has become compulsory to wear a face mask when travelling on Eurostar trains to France and Belgium, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 4, 2020. REUTERS/Toby Melville

A Passenger wearing a protective face mask arrives at St Pancras Eurostar station in London, On the first day that it has become compulsory to wear a face mask when travelling on Eurostar trains to France and Belgium, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 4, 2020. REUTERS/Toby Melville

Passengers wearing protective face masks queue at St Pancras Eurostar station in London, On the first day that it has become compulsory to wear a face mask when travelling on Eurostar trains to France and Belgium, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 4, 2020. REUTERS/Toby Melville

Passengers wearing protective face masks maintain social distance as they queue at St Pancras Eurostar station in London, On the first day that it has become compulsory to wear a face mask when travelling on Eurostar trains to France and Belgium, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 4, 2020. REUTERS/Toby Melville

A Passenger wearing a protective face mask arrives at St Pancras Eurostar station in London, On the first day that it has become compulsory to wear a face mask when travelling on Eurostar trains to France and Belgium, following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 4, 2020. REUTERS/Toby Melville

A sign warning passengers of travel restrictions is seen at the Eurostar terminal of London St Pancras station as the coronavirus disease (COVID-19) outbreak continues, in London, Britain March 17, 2020. REUTERS/John Sibley

People board a Eurostar train that travels from London to Paris, in London, Britain, January 31, 2020. REUTERS/Antonio Bronic

A man enters a Eurostar train that travels from London to Paris, in London, Britain, January 31, 2020. REUTERS/Antonio Bronic

A woman enters a Eurostar train travelling from London to Paris, in London, Britain, January 31, 2020. REUTERS/Antonio Bronic

General view of the St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/Alkis Konstantinidis

General view of the St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/Alkis Konstantinidis

People wait due to Eurostar delays at St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/Alkis Konstantinidis

A passenger looks at an announcement board as people wait due to Eurostar delays at St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/Alkis Konstantinidis

People wait due to Eurostar delays at St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/Alkis Konstantinidis

People wait due to Eurostar delays at St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/Alkis Konstantinidis

People wait due to Eurostar delays at St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/Alkis Konstantinidis

People wait due to Eurostar delays at St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/William James

People wait in line due to Eurostar delays at St Pancras Railway Station in London, Britain, March 30, 2019. REUTERS/William James

An Eurostar high-speed train speeds on the LGV Nord rail track outside Seclin, France, March 29, 2019. REUTERS/Pascal Rossignol

An Eurostar high-speed train speeds on the LGV Nord rail track outside Seclin, France, March 29, 2019. REUTERS/Pascal Rossignol

An Eurostar high-speed train speeds on the LGV Nord rail track outside Seclin, France, March 29, 2019. REUTERS/Pascal Rossignol

An Eurostar high-speed train speeds on the LGV Nord rail track outside Seclin, France, March 29, 2019. REUTERS/Pascal Rossignol

An Eurostar high-speed train speeds on the LGV Nord rail track outside Seclin, France, March 29, 2019. REUTERS/Pascal Rossignol

An Eurostar high-speed train speeds on the LGV Nord railtrack outside Seclin, France, March 29, 2019. REUTERS/Pascal Rossignol

An Eurostar high speed train enters the Channel Tunnel in Coquelles, near Calais France, March 1, 2019. REUTERS/Pascal Rossignol

Soccer Football - River Plate fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Madrid, Spain - December 9, 2018 River Plate fans outside the Hotel Eurostars Madrid Tower before the match REUTERS/Susana Vera

Soccer Football - River Plate fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Madrid, Spain - December 9, 2018 River Plate fans outside the Hotel Eurostars Madrid Tower before the match REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans outside the team hotel REUTERS/Susana Vera TPX IMAGES OF THE DAY

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 General view of Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 General view of Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 General view of Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 General view of Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 General view as the Boca Juniors team coach arrives at the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 General view as the Boca Juniors team coach arrives at the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors' Carlos Tevez and team mates applaud and wave to their fans outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as the Boca Juniors team coach arrives REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors' Carlos Tevez and team mates applaud and wave to their fans outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as they await the arrival of the Boca Juniors team coach REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as they await the arrival of the Boca Juniors team coach REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as they await the arrival of the Boca Juniors team coach REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel as they await the arrival of the Boca Juniors team coach REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 General view of Boca Juniors fans outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans let off smoke bombs outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans and police outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans outside the team hotel REUTERS/Susana Vera

Soccer Football - Boca Juniors Fans ahead of the Copa Libertadores match between River Plate and Boca Juniors - Eurostars Suites Mirasierra, Madrid, Spain - December 8, 2018 Boca Juniors fans outside the team hotel REUTERS/Susana Vera