Prime Minster Theresa May is to give further details of her plans for Brexit in a speech today, in which she will declare she does not want an outcome which leaves the UK "half-in, half-out" of the European Union.

Extracts released by Downing Street in advance of the much-awaited address are likely to fuel speculation that the Prime Minister is ready to take Britain out of the European single market and customs union, though it remained unclear whether she will give a definitive answer on the question.

Mrs May will say that she wants a "truly global Britain" which will be "more outward-looking than ever before" and will remain "the best friend and neighbour" of the other 27 members of the EU.

But she will insist that she is not "seeking to hold on to bits of membership" or to achieve a "partial" or "associate" membership of the EU.

The pound tumbled below 1.20 US dollars on the eve of the London address, and a further day of market volatility is expected as nervous traders weigh up the possible impact of Mrs May's comments on Britain's future trading relationship with the continent.

Downing Street said that Mrs May will set out 12 negotiating priorities for the upcoming EU withdrawal talks, driven by the principles of certainty and clarity and the aims to make Britain stronger, fairer and "truly global".

But aides declined to spell out precise details of what the priorities will be.

So we want to know, what do you want her to say?