PM: EU Vote Biggest Decision Of Our Lifetimes

Britain faces one of the biggest political decisions of a lifetime in deciding whether to remain in the European Union, David Cameron will say in a speech outlining the case for EU reform.

The Prime Minister will make a list of demands for reform in a letter to the President of the European Council, Donald Tusk, on Tuesday.

In a keynote speech to be delivered on the same day, Mr Cameron is expected to say that the British people hold the "country's destiny in your hands".

"You, the British people, will decide," Mr Cameron will say.

"At that moment, you will hold this country's destiny in your hands. This is a huge decision for our country, perhaps the biggest we will make in our lifetimes."

He will say: "Today, as we confront fresh threats and dangers to our country, I am in no doubt that for Britain the European question is not just a matter of economic security, but of national security too – not just a matter of jobs and trade but of the safety and security of our nation.

"I am not saying for one moment that Britain couldn't survive outside the European Union.

"Of course we could. We are a great country."

But he will add: "Whether we could be successful outside the European Union is not the question.

"The question is whether we would be more successful in than out? Whether being in the European Union adds to our economic security or detracts from it?

"Whether being in the European Union makes us safer or less safe?"