Due to public pressure, the British government is beginning, reluctantly, to get a little more real in its defence of the two British detainees in Guantanamo's Camp Delta. Now the government claims to be at least discussing extradition, although that appears to be full of legal complications in itself.
Perhaps the reason for the reluctance is that it is difficult to lodge a very strong protest to US treatment of British citizens when the UK is doing almost the same thing to foreign detainees here. The difference is that the detention itself is more humane, and the death penalty is not at issue. But Britain has suspended the European human rights guarantees it otherwise adheres to in order to hold these secret trials, and to detain certain asylum-seekers or refugees indefinitely without charges.
Also being held in Camp Delta are two accused terrorists who, though not British citizens, were "London businessmen", now in a sort of stateless legal limbo.