A WARNING letter to Theresa May over her approach to Brexit has been signed by Oxford East MP Andrew Smith.

Mr Smith is among 43 Labour MPs who have signed the letter.

It comes ahead of a Supreme Court ruling tomorrow on whether Parliament must vote before Article 50 is triggered and Britain begins to leave the EU.

Mr Smith said: “Whilst the referendum result must be honoured, no-one voted to make our country poorer.

"If the Commons gets the chance to vote on the approach to leaving the EU, I will vote for amendments to stay in the single market and to protect employment and environmental standards. 

"These are crucial for Oxford, in particular our car industry, recruitment to health services, universities and science research.”