They most decidedly don't want to "do Europe" therefore, because they feel it weakens the attack on Brown.
It weakens the attack on Brown, only in is as much as the next question, will always be, "well what are you going to do about it", to which they can only mumble and look like idiots, with their current policy of, in but not run by etc.
The Tory's are the worst of all the 3 main parties on Europe. The Lib-Dums have never hidden their enthusiasm and Labour long ago embraced it, even though the evidence against being a member, piles up almost hourly, though that kind of situation, hasn't stopped either of them supporting other crackpot ideas.
Meanwhile the Tory's continue to be neither one or the other. It's painfully apparent, that if it wasn't for their grassroot's hatred of the EU, far too many of the MP's would be as eager as the Lib-Dums and even worse that enthusiasm would not be ideological, but purely from self interested greed. After all haveing no legislative power and thus nothing to actually do, allows far more time for peruseing the John Lewis website, followed by a very long, lobbyist paid for lunch and reluctantly accepting yet another consultancy position, along with loads of non declarable freebies.