LONDON, ENGLAND - NOVEMBER 06:  British Prime Minister Gordon Brown delivers a speech to the Royal College of Defence Studies setting out Britain's position in the on-going war in Afghanistan on November 6, 2009 in London, England. Mr Brown is coming under increasing pressure to justify the case for the Afghan conflict following a recent series of killings of British servicemen in the country. Getty Images logo Getty Images 3 weeks ago

LONDON, ENGLAND - NOVEMBER 06: British Prime Minister Gordon Brown delivers a speech to the Royal College of Defence Studies setting out Britain's position in the on-going war in Afghanistan on November 6, 2009 in London, England. Mr Brown is coming under increasing pressure to justify the case for the Afghan conflict following a recent series of killings of British servicemen in the country.