– Former Deputy Prime Minister Lord Heseltine
To commit to a referendum about a negotiation that hasn't begun, on a timescale you cannot predict, on an outcome that's unknown, where Britain's appeal as an inward investment market would be the centre of the debate, seems to me like an unnecessary gamble.
If I was responsible for inward investment into any of our European colleagues, it would give me the best argument I could dream of.
Why put your factory [in Britain] when you don't know - and they can't tell you - the terms upon which you will trade with us in future?
Downing Street says David Cameron's speech on Europe will be delivered in central London on Wednesday.