Prime Minister David Cameron recreates the famous Beatles Abbey Road album cover by walking across Abbey Road crossing with Tessa Jowell, former secretary of state for culture, media and sport, on May 20, 2016 in London, England

Jeremy Selwyn/WPA Pool/Getty Images

Prime Minister David Cameron recreates the famous Beatles Abbey Road album cover by walking across Abbey Road crossing with Tessa Jowell, former secretary of state for culture, media and sport in London today

LONDON, ENGLAND - MAY 20:  Poppies are installed in an installation at Royal Hospital Chelsea on May 20, 2016 in London, England. The installation comprises of a tribute of almost 300,000 handcrafted poppies created by landscape designer Phillip Johnson. The display is in honour of all servicemen and women who have fought across all wars, conflicts and peacekeeping operations over the last 100 years, and will be on display at the 2016 RHS Chelsea Flower Show from 24-28 May 2016.  (Photo by Dan Kitwood/Getty Images)

Dan Kitwood/Getty

Poppies are installed in an installation at Royal Hospital Chelsea in London. The installation comprises of almost 300,000 handcrafted poppies created by landscape designer Phillip Johnson. The display is in honour of all servicemen and women who have fought across all wars, conflicts and peacekeeping operations over the last 100 years, and will be on display at the 2016 RHS Chelsea Flower Show.

A man passes closed shops at Hastings in southeast England May 9, 2016. To match Special Report BRITAIN-EU/UNDECIDED    REUTERS/Luke MacGregor

Luke MacGregor/Reuters

A man passes closed shops at Hastings in southeast England 

Volunteers of the Azov Civil Corps light flares during rally at the Ukrainian Parliament, Friday, May 20, 2016, against holding local elections in the occupied eastern territories of Ukraine. As part of an internationally brokered peace agreement, Ukraine must hold local elections in two eastern regions controlled by Russian-backed rebels, but there are major concerns about ensuring the vote takes place in a secure and safe atmosphere. (AP Photo/Efrem Lukatsky)

Efrem Lukatsky/AP

Volunteers of the Azov Civil Corps light flares during rally at the Ukrainian Parliament against holding local elections in the occupied eastern territories of Ukraine. As part of an internationally brokered peace agreement, Ukraine must hold local elections in two eastern regions controlled by Russian-backed rebels, but there are major concerns about ensuring the vote takes place in a secure and safe atmosphere

South Korean policemen take part in an anti-terror and security drill at a mall in Seoul, South Korea, May 20, 2016.   REUTERS/Kim Hong-Ji

Kim Hong-Ji/Reuters

South Korean policemen take part in an anti-terror and security drill at a mall in Seoul, South Korea 

Miriam Fatime Sylla of Italy spikes the ball against Netherland during their Women's Volleyball World Olympic qualification tournament in Tokyo, Japan, Friday, May 20, 2016. (AP Photo/Koji Sasahara)

Koji Sasahara/AP

Miriam Fatime Sylla of Italy spikes the ball against Netherland during their Women’s Volleyball World Olympic qualification tournament in Tokyo, Japan 

Mayor of London Sadiq Khan (left) meets former mayor of New York Michael Bloomberg at City Hall in London

Stefan Rousseau/PA

Mayor of London Sadiq Khan (left) meets former mayor of New York Michael Bloomberg at City Hall in London today, as the billionaire has warned Brexit would damage Britain’s economy.

In this undated handout picture taken recieved on May 19, 2016 from James Cook University shows life on the Great Barrier Reef in Queensland.   Australia's Great Barrier Reef could be beyond saving in five years without "now or never" funding to improve water quality as climate change ravages the World Heritage-listed site, scientists warned on May 19, 2016. / AFP PHOTO / JAMES COOK UNIVERSITY / MATT CURNOCKMATT CURNOCK/AFP/Getty Images

Matt Curnock/AFP/Getty

Marine life on the Great Barrier Reef in Queensland. Australia‘s Great Barrier Reef could be beyond saving in five years without “now or never” funding to improve water quality as climate change ravages the World Heritage-listed site, scientists have warned

TOPSHOT - French riot police officers stand guard after receiving some paint on their uniform, during a demonstration to protest against the government's labour reform on May 19, 2016 in Bordeaux.  France was disrupted by a third straight day of strikes and demonstrations on May 19 as the prime minister called for protesters who torched a police car to face "harsh" punishment. The labour reforms have sparked two months of protests on France's streets, drawing 68,000 nationwide on Tuesday, police said, while organisers put the turnout at 220,000

George Gobet/AFP

French riot police officers stand guard after receiving some paint on their uniform, during a demonstration to protest against the government’s labour reform today in Bordeaux. France was disrupted by a third straight day of strikes and demonstrations as the prime minister called for protesters who torched a police car to face “harsh” punishment. The labour reforms have sparked two months of protests on France’s streets, drawing 68,000 nationwide on Tuesday, police said, while organisers put the turnout at 220,000.

Chair of the Board of Governors of the F...Chair of the Board of Governors of the Federal Reserve System Janet L. Yellen (L) chats with US Secretary of the Treasury Jacob J. Lew (C) during a welcome reception hosted by the City of Sendai on May 19, 2016. The group -- including US Treasury Secretary Jacob Lew and European Central Bank President Mario Draghi -- will converge at a hot spring town north of Tokyo where two days of meetings kick off from May 20. / AFP PHOTO / KAZUHIRO NOGIKAZUHIRO NOGI/AFP/Getty Images

Kazuhiro Nogi/AFP/Getty

Chair of the Board of Governors of the Federal Reserve System Janet L. Yellen chats with US Secretary of the Treasury Jacob J. Lew during a welcome reception hosted by the City of Sendai, Japan 

A general view of a Neapolitan pizza made to break the world record for the longest pizza ever made, by making a two kilometers margherita

Circo Fusco/EPA

A general view of a Neapolitan pizza made to break the world record for the longest pizza ever made, by making it a two kilometres margherita (16 inch wide) pizza stretching along the city waterfront, in Naples

Cast member Lea Seydoux poses during a photocall for the film "Juste la fin du monde" (It's Only the End of the World) in competition at the 69th Cannes Film Festival in Cannes, France, May 19, 2016.

Regis Duvignau/Reuters

Cast member Lea Seydoux poses during a photocall for the film “Juste la fin du monde” (It’s Only the End of the World) directed by Xavier Dolan in competition at the 69th Cannes Film Festival in Cannes, France today.

Greenpeace protesters climb the British Museum in London, in protest against BP's sponsorship of the museum's Sunken Cities exhibition. PRESS ASSOCIATION Photo. Picture date: Thursday May 19, 2016. See PA story ENVIRONMENT Protest. Photo credit should read: Anthony Devlin/PA Wire

Anthony Devlin/PA

Greenpeace protesters climb the British Museum in London, in protest against BP’s sponsorship of the museum’s Sunken Cities exhibition

Swimming- European Aquatics Championships- London, Britain, 19/5/2016. Sweden's Louise Hannson starts in the women's 100m butterfly preliminary event.   REUTERS/Stefan Wermuth

Stefan Wermuth/Reuters

Sweden’s Louise Hannson starts in the women’s 100m butterfly preliminary event European Aquatics Championships London, Britain

A man dresses a statue figure on the monument dedicated to Kiev city founders, in the national Ukrainian costume called Vyshyvanka,  on the Independence Square in Kiev, Ukraine, Thursday, May 19, 2016.  Ukrainians mark Vyshyvanka Day, named in honour of the Slavic traditional clothing Vyshyvanka. (AP Photo/Efrem Lukatsky)

Efrem Lukatsky/AP

A man dresses a statue figure on the monument dedicated to Kiev city founders, in the national Ukrainian costume called Vyshyvanka, on the Independence Square in Kiev, Ukraine. Ukrainians mark Vyshyvanka Day, named in honour of the Slavic traditional clothing Vyshyvanka 

Supporters of Trinamool Congress (TMC) celebrate after learning the initial poll results of the West Bengal Assembly elections, in Kolkata, India May 19, 2016. REUTERS/Rupak De Chowdhuri

Rupak De Chowdhuri/Reuters

Supporters of Trinamool Congress (TMC) celebrate after learning the initial poll results of the West Bengal Assembly elections, in Kolkata, India 

A model wears a hat as she presents a creation from the fashion label Bondi Bather during Australian Fashion week in Sydney, Australia, May 19, 2016. REUTERS/David Gray

David Gray/Reuters

A model wears a hat as she presents a creation from the fashion label Bondi Bather during Australian Fashion week in Sydney, Australia

Softbank Robotics Event As Company Allows Android App Development For Pepper

Kiyoshi Ota/Bloomberg

An attendant holds a Google Inc. Cardboard virtual reality headset to demonstrate SoftBank Group Corp.’s Pepper the humanoid robot at a media briefing in Tokyo, Japan, on Thursday

A police car explodes after being set on fire during an unauthorized counter-demonstration against police violence on May 18, 2016 in Paris

Rielle Sicard/AFP/Getty

A police car explodes after being set on fire during an unauthorized counter-demonstration against police violence today in Paris, as Police across France demonstrate today against the “anti-cop hatred” they say they have endured during a wave of anti-government protests since early March

Photographer Martin Parr looks out from his own caravan which is serving food at the Photo London show in London, Britain, May 18, 2016

Kevin Coombs/Reuters

Photographer Martin Parr looks out from his own caravan which is serving food at the Photo London show in London, Britain today