Writing in the Sunday Telegraph, Cameron has for the first time set out his key priorities for change in a seven-point plan. They are:

• Powers flowing away from Brussels, not always to it

• National parliaments able to work together to block unwanted European legislation

• Businesses liberated from red tape and benefiting from the strength of the EU's own market to open up greater free trade with North America and Asia

• UK police forces and justice systems able to protect British citizens, unencumbered by unnecessary interference from the European institutions, including the European court of human rights

• Free movement to take up work, not free benefits

• Support for the continued enlargement of the EU to new members but with new mechanisms in place to prevent vast migrations across the continent

• Ensuring Britain is no longer subject to the concept of "ever closer union", enshrined in the treaty, to which every EU country currently has to sign up.

but that's just it, no matter what happens they'll present it as a victory.