It seems an interesting case, the suspects didn't actually "do" anything, but they had bought the makings of a bomb, and were apparently interested in being agents for purchase of a nuclear bomb, although from the article itself I can only surmise they wanted the makings of a 'dirty' bomb, not necessarily an atomic bomb. Is this playing big in Britain? I haven't seen much about it here in the states.
We're entering the era of 'intent' on trial moreso than proven actions.
Would Guy Fawkes have been so easy to try if he'd been found with casks of gunpowder in the woodshed and a tunnel drawing on a sheet of foolscap?