Today: UK 'is real frontline' in terrorism fight

Britain's presence in Afghanistan has been seriously questioned this week following the deaths of seven army personnel, and calls from former junior Foreign Office minister Kim Howells MP to withdraw all troops from the country. Prime Minister Gordon Brown yesterday defended Britain's continued presence, saying that troops there are "our first line of defence" against terrorist attacks on British streets. Shadow security minister Baroness Pauline Neville Jones and the chairman of the Royal United Services Institute, Sir Paul Lever, debate the government's Afghan policy and whether the fight against Islamic extremism should be concentrated at home or abroad.