British intelligence officials believe that al-Qaida is determined to attack the UK with a nuclear weapon, it emerged yesterday. The announcement, from an officially organised Foreign Office counter-terrorism briefing for the media, was the latest in a series of bleak assessments by senior officials and ministers about the terrorist threat facing Britain. UK officials have detected "an awful lot of chatter" on jihadi websites expressing the desire to acquire chemical, biological, radiological or nuclear weapons.... The warning comes after a speech last week by the foreign secretary, Margaret Beckett, on the terrorist threat facing the UK, and a rare public...