Bad news for Liberal Democrat justice spokesman David Heath, who announced last week that he would be backing Tory calls for a referendum on Europe and said it would be up to Nick Clegg to decide his political future.
It seems the Lib Dem chief intends to stand firm on the issue.
"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."
