Despite the offer of concessions, the Conservative Party will face a rebellion over Europe. It is not a case of if, only when and how large it is.
There are many within the Conservative Party who will not be happy about the re-negotiated settlement whatever it looks like.
The more the Prime Minister gives ground, the more they will try to take ground. And that is before we have even got to the discussions with other Member States.
Labour too will have its issues and internal splits but they, for the moment at least, are concentrating on their leadership battle.
This could lead to some interesting alliances.
The government has moved to try and head off rebellions by Conservative MPs over the timing of an EU referendum and the rules for a future campaign.Ministers have conceded the poll will not be held on 5 May 2016, the same day as elections to devolved parliaments in Scotland, Wales and Northern Ireland.They will also review the application of "purdah" rules limiting government announcements in the run-up to polls.