A board shows the current standing of the British Pound Sterling on the floor of the New York Stock Exchange (NYSE) shortly after the opening bell in New York, U.S., July 6, 2016. REUTERS/Lucas Jackson

A board shows the current standing of the British Pound Sterling of floor of the New York Stock Exchange (NYSE) shortly after the opening bell in New York, U.S., July 5, 2016. REUTERS/Lucas Jackson

A cash machine ATM that offers withdrawals in either Pound Sterling or Euros is seen in Canary Wharf Financial centre in London, Britain, June 30, 2016. REUTERS/Russell Boyce

A cash machine ATM that offers withdrawals in either Pound Sterling or Euros is seen in Canary Wharf Financial centre in London, Britain, June 30, 2016. REUTERS/Russell Boyce

A cash machine ATM that offers withdrawals in either Pound Sterling or Euros is seen in Canary Wharf Financial centre in London, Britain, June 30, 2016. REUTERS/Russell Boyce

A board above the floor of the New York Stock Exchange (NYSE) shows the current standing of the British Pound sterling and the Euro, in New York, U.S., June 24, 2016. REUTERS/Lucas Jackson

A board above the floor of the New York Stock Exchange (NYSE) shows the current standing of the British Pound sterling, in New York, U.S., June 24, 2016. REUTERS/Lucas Jackson

A board above the floor of the New York Stock Exchange (NYSE) shows the current standing of the British Pound sterling in New York, U.S., June 24, 2016. REUTERS/Lucas Jackson

A board above the floor of the New York Stock Exchange (NYSE) shows the current standing of the British Pound sterling in New York, U.S., June 24, 2016. REUTERS/Lucas Jackson

A board above the floor of the New York Stock Exchange (NYSE) shows the current standing of the British Pound sterling in New York, U.S., June 24, 2016. REUTERS/Lucas Jackson

Wads of British Pound Sterling banknotes are stacked in piles at the GSA Austria (Money Service Austria) company's headquarters in Vienna July 22, 2013. REUTERS/Leonhard Foeger/File Photo

An employee is seen walking over a mosaic of pound sterling symbols set in the floor of the front hall of the Bank of England in London, in this March 25, 2008 file photograph. REUTERS/Luke MacGregor/File Photo 

A man walks past various currency signs, including the dollar (top R), Australian dollar (top L), pound sterling (centre L) and Euro (bottom L), outside a brokerage in Tokyo October 28, 2014. REUTERS/Yuya Shino/File Photo 

Wads of British Pound Sterling banknotes are stacked in piles at the GSA Austria (Money Service Austria) company's headquarters in Vienna July 22, 2013. REUTERS/Leonhard Foeger/File Photo 

The Governor of the Bank of England, Mark Carney, unveils the full design of the new polymer polymer 5 pound Sterling note featuring Sir Winston Churchill, at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The Governor of the Bank of England, Mark Carney, unveils the full design of the new polymer polymer 5 pound Sterling note featuring Sir Winston Churchill, at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The Governor of the Bank of England, Mark Carney, unveils the full design of the new polymer polymer 5 pound Sterling note featuring Sir Winston Churchill, at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The new polymer 5 pound Sterling note featuring Sir Winston Churchill, is unveiled at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The new polymer 5 pound Sterling note featuring Sir Winston Churchill, is unveiled at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The new polymer 5 pound Sterling note featuring Sir Winston Churchill, is unveiled at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The new polymer 5 pound Sterling note featuring Sir Winston Churchill, is unveiled at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The new polymer 5 pound Sterling note featuring Sir Winston Churchill, is unveiled at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The new polymer 5 pound Sterling note featuring Sir Winston Churchill, is unveiled at Blenheim Palace in Oxfordshire, Britain June 2, 2016. REUTERS/Joe Giddens/Pool 

The petrol and diesel prices displayed in pounds sterling per litre by the Total Oil company in the countryside of Wales, January 29, 2016. REUTERS/Rebecca Naden/File Photo GLOBAL BUSINESS WEEK AHEAD PACKAGE - SEARCH 'BUSINESS WEEK AHEAD APRIL 25' FOR ALL IMAGES 

A two Euro coin is pictured next to a one Pound coin on top of a portrait of Britain's Queen Elizabeth in this file photo illustration shot March 16, 2016. REUTERS/Phil Noble/Illustration/Files 

The petrol and diesel prices displayed in pounds sterling per litre by the Asda Supermarket in the town of Pembroke Dock, Wales, January 29, 2016. The price of oil recently has had a downward pressure on the global economy. REUTERS/Rebecca Naden 

The petrol and diesel prices displayed in pounds sterling per litre by the Asda Supermarket in the town of Pembroke Dock, Wales, January 29, 2016. The price of oil recently has had a downward pressure on the global economy. REUTERS/Rebecca Naden 

The petrol and diesel prices displayed in pounds sterling per litre by the Total Oil company in the countryside of Wales, January 29, 2016. REUTERS/Rebecca Naden 

The petrol and diesel prices displayed in pounds sterling per litre by the Asda Supermarket in the town of Pembroke Dock, Wales, January 29, 2016. The price of oil recently has had a downward pressure on the global economy. REUTERS/Rebecca Naden 

The petrol and diesel prices displayed in pounds sterling per litre by the Total Oil company in the countryside of Wales, January 29, 2016. REUTERS/Rebecca Naden 

The petrol and diesel prices displayed in pounds sterling per litre by the Total Oil company in the countryside of Wales, January 29, 2016. REUTERS/Rebecca Naden 

The petrol and diesel prices displayed in pounds sterling per litre by the Murco Oil company and operated by the High Noon Stores, Llanteg, Wales, January 28, 2016. REUTERS/Rebecca Naden 

The petrol and diesel prices displayed in pounds sterling per litre by the Murco Oil company and operated by the High Noon Stores, Llanteg, Wales, January 28, 2016. REUTERS/Rebecca Naden 

The petrol and diesel prices displayed in pounds sterling per litre by the Murco Oil company and operated by the High Noon Stores, Llanteg, Wales, January 28, 2016. REUTERS/Rebecca Naden 

An employee is seen walking over a mosaic of pound sterling symbols set in the floor of the front hall of the Bank of England in London, in this March 25, 2008 file photograph. Weakness in the sterling currency is a "foretaste" of what the impact would be if Britain voted to leave the European Union at an upcoming membership referendum, Foreign Secretary Philip Hammond said on February 25, 2016. REUTERS/Luke Macgregor/files 

An employee is seen walking over a mosaic of pound sterling symbols set in the floor of the front hall of the Bank of England in London, in this March 25, 2008 file photograph. Sterling had its biggest one-day loss against the dollar in 11 months on February 22, 2016 after London Mayor Boris Johnson threw his weight behind the campaign to leave the European Union, dealing a blow to David Cameron by increasing the chance of a British exit from the EU. REUTERS/Luke MacGregor/Files TPX IMAGES OF THE DAY

Offices are seen at dusk as St. Paul's Cathedral and construction cranes are seen on the skyline in the City of London, Britain November 2, 2015. Sterling rose against the dollar and the euro on Thursday after data showed Britain's economy growing in line with expectations in the fourth quarter, offering some relief to the battered pound. Fourth-quarter gross domestic product grew by 0.5 percent, up slightly from 0.4 percent in the three months to September, the Office for National Statistics said on Thursday. This was in line with economists' forecasts. REUTERS/Toby Melville

A mural of the Beatles is seen painted on the end of a row of terraced houses in Liverpool, northern England February 18, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on February 18. REUTERS/Phil Noble

Graffiti left by Beatles fans covers the entrance to the former Strawberry Fields children's home in Liverpool northern England, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 2. REUTERS/Phil Noble

Tourists poses as Beatles in a themed coffee shop in Liverpool northern England, Britain, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 13. REUTERS/Phil Noble

Graffiti left by Beatles fans covers a painted road sign on a wall on Penny Lane in Liverpool northern England, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 2. REUTERS/Phil Noble

Graffiti left by Beatles fans covers a painted road sign on a wall on Penny Lane in Liverpool northern England, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 2. REUTERS/Phil Noble

Women are seen in a Beatles themed coffee shop in Liverpool northern England, in Britain, March 13, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 13. REUTERS/Phil Noble

Tourists ride on a magical mystery tour mini-bus near Paul McCartney's childhood home in Liverpool northern England, Britain, March 24, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 24. REUTERS/Phil Noble

A statue hangs on a wall on Matthew Street home of the Cavern club in Liverpool northern England, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 2. REUTERS/Phil Noble

French tourists take photographs of the childhood home of Paul McCartney in Liverpool northern England, Britain, March 24, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 24. REUTERS/Phil Noble

A Beatles themed painting hangs on the wall of a hotel foyer in Liverpool northern England, Britain, August 15, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on August 15. REUTERS/Phil Noble

A woman looks out of the window of a shop above the Beatles Shop in Liverpool northern England, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 2. REUTERS/Phil Noble

A likeness of Paul McCartney made from Jelly Beans is seen in the window of a sweet shop in Liverpool northern England, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 2. REUTERS/Phil Noble

People walk past a photograph of the Beatles outside of a music shop in Liverpool northern England, Britain, March 24, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 24. REUTERS/Phil Noble

Tourists on the 'Fab Four Taxi Tour' stop outside the gates of Strawberry Fields in Liverpool northern England, Britain, March 24, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 24. REUTERS/Phil Noble

A woman walks past a picture of the Beatles made from Jelly Beans in the window of a sweet shop in Liverpool northern England, Britain, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 2. REUTERS/Phil Noble

Tourists pose for photographs next to a statue of John Lennon in Liverpool northern England, Britain, August 16, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on August 16. REUTERS/Phil Noble

The faces of the four Beatles appear on the fabric of a shirt for sale in a shop in Liverpool northern England, March 2, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on March 2. REUTERS/Phil Noble

Caricatures of the Beatles advertise a meal offer in the window of a pub in Liverpool northern England, Britain, August 16, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on August 16. REUTERS/Phil Noble

A boy queues to enter the Beatles Story museum in Liverpool northern England, Britain, August 16, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on August 16. REUTERS/Phil Noble

People have a drink and listen to music inside the Cavern Club in Liverpool northern England, Britain, August 16, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on August 16. REUTERS/Phil Noble

A man walks past a mural depicting the faces of The Beatles inside the Cavern Club in Liverpool northern England, Britain, August 16, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on August 16. REUTERS/Phil Noble

Graffiti covers the walls and ceilings inside the Cavern Club in Liverpool northern England, Britain, August 15, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on August 15. REUTERS/Phil Noble

People take photographs of the stage inside the Cavern Club in Liverpool northern England, Britain, August 16, 2015. Fifty years on since the group performed for the last time in their home city the group's presence is still felt with fans of the Fab Four from across the globe adding around 70 million pounds sterling (US$105 million) to the local economy each year according to industry organisation UK Music. Picture taken on August 16. REUTERS/Phil Noble