Some quick fire observations:
Nick Griffin did badly. He was evasive on the holocaust in particular but there was no killer blow.
Sayeeda Warsi did well. Bonnie Greer did very well.
I don't however think the BNP will be unhappy at the end of it all. They raised their issues - immigration, in particular. At times Nick Griffin looked bullied. That'll play into his 'we are victims' tactic.
Forgeting the theatre of tonight the BNP will persist so long as the mainstream parties aren't strong enough on immigration, patriotism and social justice.
The BNP can't be defeated in sixty minutes but tonight showed that Griffin can be beaten in the end.