LONDON, UNITED KINGDOM - MAY 18: Thousands of people with the Save the National Health Service (NHS) campaign on May 18, 2013 in London, England. Campaigners are protesting against cuts and partial privatisation of the NHS. PHOTOGRAPH BY George Henton / Barcroft Media

BIRMINGHAM, UNITED KINGDOM - MAY 18: Shayne Ward (Dancing On Ice - X Factor) at Footy 4 Harry celebrity charity football match at St. Andrew’s Birmingham FC in aid of Help Harry Help Others Charity on May 18, 2013 in Birmingham, England. PHOTOGRAPH BY Graham Stone / Barcroft Media

LONDON, UNITED KINGDOM - MAY 17: Victoria Pendleton attends the Jamie Oliver Food Revolution street festival on May 17, 2013 in London, England. PHOTOGRAPH BY Ruaridh Connellan / Barcroft Media

Nick of the London College of Garden Design sets up a plant of Rosa Veilchenblau during the preparations for the RHS Chelsea Flower Show 2013 edition on May 16, 2013 in London, England.. 'Veilchenblau' is a hybrid multiflora rose cultivar that was bred in Germany in 1909.

Armed police officers arrest a young man on May 15, 2013 in Luton, England. A man is arrested yesterday (Wednesday, May 16) on the Marsh Farm estate, Luton, where armed patrols have been implemented following a shooting on Saturday. A 16-year-old boy was shot shortly before 04:00 BST in Thricknells Close, Marsh Farm. It led to an increased police presence. Reports say a 19-year-old man is being held on suspicion of attempted murder, following the shooting of a teenager in Luton.

United Nations Secretary-General Ban Ki-moon (R) shakes hands with British Prime Minister David Cameron prior to their meeting at the UN headquarters in on May 15, 2013 in New York City.