You have to love the British authorities - when confronted with a problem, they lie reflexively, and blame explosions on "power surges" - even when they occur on buses.
Update: Survivors' reports here.
Update 2: Yes, the early reports I was reading really were as described above, and they seemed more than a little reminiscent of BSE. But in retrospect, I've obviously made a bit of a dick of myself. Again.