Q&A: Tory row over an EU referendum

Debate is raging in the Conservative Party about Britain's future membership of the EU. Here's a guide to what MPs are arguing about:

Why is the Conservative Party arguing about Europe?

Why has the issue come up now?

What does David Cameron think?

What sort of powers does the UK want back?

Why does Cameron think he can agree changes with EU leaders?

Does Cameron want the UK to leave the EU?

Why are some Tory MPs unhappy?

What happens next?

Will the draft bill become law?

So are we going to have a referendum or not?

How has UKIP reacted?

What does Labour think?

What do the other parties think?