Clegg: Heath will have to toe the line or step down...

So says the Guardian any way:

"There is no question of a free vote on this matter; there will definitely be a party whip and as a member of the frontbench David will be bound by the same collective responsibility as everyone else," a source close to Clegg says.

"If he feels he can't toe the party line then he will have no choice but to stand down."

Personally I am torn: I am not a great fan of the Lisbon Treaty, and I am a big fan of David Heath. But I think the Shadow Cabinet needs to adhere to the principle of collective responsibility.

I discussed this just the other day.