In a Sunday Telegraph article today, Mr Cameron insisted that only the Conservatives can deliver reform in the EU and a referendum.
Speaking about Conservative party rivals for the European election, David Cameron referenced Dad's Army character Private Frazer:
There are politicians who refuse to be upbeat about Britain.
To them, pessimism equals patriotism.
They insist that our best days are behind us and that everything is bound to get worse.
Like Private Frazer politicians they're perennially crying out that 'we're all doomed'.
More top news
Bruce Carr QC, who led the government's industrial relations review, tells ITV News the Trade Union Bill will give employers too much power
A family pet was repeatedly kicked to within an inch of its life by burglars who broke into a home, police have said.
It's set to remain cold and frosty, Sunday to be drier than tomorrow.