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Novak Djokovic celebrates a break of serve against Kevin Anderson during day Seven of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. PRESS ASSOCIATION Photo. Picture date: Tuesday July 7, 2015

Dominic Lipinski/PA

Novak Djokovic celebrates a break of serve against Kevin Anderson during day Seven of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon

British Prime Minister David Cameron (R) and London Mayor Boris Johnson during a ceremony at the memorial to the victims of the July 7, 2005 London bombings, in Hyde Park on July 7, 2015 in London, England. Today is the tenth anniversary of the 7/7 bombings, when four suicide bombers struck transport system in central London on Thursday 7 July 2005, killing 52 people and injuring more than 770 in simultaneous attacks

Dan Kitwood/Getty Images

British Prime Minister David Cameron and London Mayor Boris Johnson during a ceremony at the memorial to the victims of the July 7 2005 London bombings, in Hyde Park on Tuesday in London, England

Summer weather July 2nd 2015...A lightning storm hits Blyth on the Northumberland coast early this morning, as thunderstorms and heavy downpours heralded cooler temperatures across the country following the hottest July day on record. PRESS ASSOCIATION Photo. Picture date: Thursday July 2, 2015. Forecasters said there would be some respite from the searing heat, which reached a maximum recorded temperature of 36.7C (98F) and caused roads to melt and rail service cancellations. See PA story WEATHER Heatwave. Photo credit should read: Owen Humphreys/PA Wire

Owen Humphrey/PA

A lightning storm hits Blyth on the Northumberland coast early this morning, as thunderstorms and heavy downpours heralded cooler temperatures across the country following the hottest July day on record

Lorries parked on both carriageways of the M20 in Ashford, Kent, as Operation Stack remains in place due to industrial action in Calais on what is predicted to be the hottest day of the year so far.

Gareth Fuller/PA Wire

Lorries parked on both carriageways of the M20 in Ashford, Kent, as Operation Stack remains in place due to industrial action in Calais on what is predicted to be the hottest day of the year so far.

A cleaner works on Centre Court ahead of play on day three at Wimbledon on July 1, 2015 in London, England. The 129th tournament to be hosted at Wimbledon is due to run for two weeks from Monday 29th June

Carl Court/Getty Images

A cleaner works on Centre Court ahead of play on day three at Wimbledon on Wednesday in London, England

Members of the emergency services take part in Exercise Strong Tower outside the disused Aldywch tube station on Surrey Street onTuesday in London, England.  The counter-terrorism training exercise will involve as many as 1,000 officers and will take place across the city until Wednesday afternoon

Rob Stothard/Getty Images

Members of the emergency services take part in Exercise Strong Tower outside the disused Aldywch tube station on Surrey Street on Tuesday in London, England

A member of ground staff updates a fixtures board on day two of Wimbledon tennis tournament on June 30, 2015 in London, England. The 129th tournament to be hosted at Wimbledon is due to run for two weeks from Monday 29th June

Carl Court/Getty Images

A member of ground staff updates a fixtures board on day two of Wimbledon tennis tournament on Tuesday in London, England. The 129th tournament to be hosted at Wimbledon is due to run for two weeks

Serena Williams of U.S.A. reacts during her match against Margarita Gasparyan of Russia at the Wimbledon Tennis Championships in London...Serena Williams of U.S.A. reacts during her match against Margarita Gasparyan of Russia at the Wimbledon Tennis Championships in London, June 29, 2015

Toby Melville/Reuters

Serena Williams of U.S.A. reacts during her match against Margarita Gasparyan of Russia at the Wimbledon Tennis Championships in London on Monday

Revellers walk through rubbish left in front of the Pyramid Stage as they leave Worthy Farm in Somerset after the Glastonbury Festival in Britain June 29, 2015

Dylan Martinez/Reuters

Revellers walk through rubbish left in front of the Pyramid Stage as they leave Worthy Farm in Somerset after the Glastonbury Festival in Britain on Monday

Fans scream for James Bay as he performs on the Pyramid stage at the Glastonbury Festival, at Worthy Farm in Somerset

Ben Birchall/PA

Fans scream for James Bay as he performs on the Pyramid stage at the Glastonbury Festival, at Worthy Farm in Somerset

A man takes his jacket off as he settles into his deck chair on a sunny day in St. James Park in London, Britain on Wednesday

Suzanne Plunkett/Reuters

A man takes his jacket off as he settles into his deckchair on a sunny day in St James’s Park, London

A festivalgoer rests in the sunshine at the Glastonbury Festival, at Worthy Farm in Somerset. PRESS ASSOCIATION Photo. Picture date: Wednesday June 24, 2015. Organisers believe around 90% of the 135,000 ticket-holders will have set up camp by the end of the day, in a bid to get the best camping spots.

Ben Birchall/PA

A festival-goer rests in the sunshine at the Glastonbury Festival, at Worthy Farm in Somerset. Organisers believe about 90% of the 135,000 ticket-holders will have set up camp by the end of the day on Wednesday.

Luisa Avietti puts the finishing touches to a mural of Ed Sheeran made out of 13,000 ticket stubs, which has been created by StubHub to celebrate the British singer being revealed as the hottest act appearing in the UK this summer, in London's Russell Square. PRESS ASSOCIATION Photo. Picture date: Monday June 22, 2015. Photo credit should read: David Parry/PA Wire

David Parry/PA

Luisa Avietti puts the finishing touches to a mural of Ed Sheeran made out of 13,000 ticket stubs, which has been created by StubHub to celebrate the British singer being revealed as the hottest act appearing in the UK this summer, in London’s Russell Square 

Racegoers await the start of racing on day four of the 2015 Royal Ascot Meeting at Ascot Racecourse, Berkshire

Dominic Lipinski/PA

Racegoers await the start of racing on day four of the 2015 Royal Ascot Meeting at Ascot Racecourse, Berkshire on Friday

Race goers walk from the train station as they arrive for the third day of the Royal Ascot horse racing meet at Ascot, England, Thursday, June 18, 2015. The third day of Royal Ascot is traditional known as Ladies day, where fashion and hats come to the fore

Alastair Grant/AP

Race goers walk from the train station as they arrive for the third day of the Royal Ascot horse racing meet at Ascot, England on Thursday. The third day of Royal Ascot is traditional known as Ladies day, where fashion and hats come to the fore

UKIP's leader, Nigel Farage, enjoys a pint of masterbrew in a pub in Westminster as UKIP launched their Euro referendum campaign.

Charlie Bibby/FT

UKIP’s leader Nigel Farage, in a pub in Westminster as UKIP launched their Euro referendum campaign 

Race-goers relax on a bench displaying the Union Flag on the first day of the annual Royal Ascot horse racing event near Windsor, west of London, on June 16, 2015.

Ben Stansall/AFP

Racegoers relax on a bench displaying the Union Jack on the first day of the Royal Ascot meeting in Berkshire, England.

 A student gives flowers to, embraces and welcomes with other young students US First Lady Michelle Obama in the courtyard before an event as part of the 'Let Girls Learn Initiative' at the Mulberry School for Girls on Tuesday in London, England. The US First Lady is travelling with her daughters, Malia and Sasha and her mother, Mrs. Marian Robinson, to continue a global tour promoting her 'Let Girls Learn Initiative'. The event at the school was to discuss how the UK and USA are working together to expand girl's education around the world

Jeff J Mitchell/Getty Images

A pupil embraces US First Lady Michelle Obama before an event at the Mulberry School for Girls in London, part of the Let Girls Learn Initiative.

The crowd watching Kodaline performing on the Main Stage at the Isle of Wight Festival, in Seaclose Park, Newport, Isle of Wight

Yui Mok/PA

The crowd watching Kodaline performing on the Main Stage at the Isle of Wight Festival, in Seaclose Park, Newport, Isle of Wight on Friday

Great Britain's Nick Dempsey comes home to win the first race of the day during the Men's RS:X windsurfing on day five of the ISAF Sailing World Cup at Weymouth. PRESS ASSOCIATION Photo. Picture date Wednesday June 12, 2015.

Andrew Matthews/PA

Great Britain’s Nick Dempsey comes home to win the first race of the day during the Men’s RSX windsurfing on day five of the ISAF Sailing World Cup at Weymouth on Friday