Mrs May on a visit yesterday to the Royal Welsh Show in Llanelwedd, where she told farmers and landowners that Brexit offered agriculture a “real opportunity for the future”

The proportion of voters who favour a second Brexit referendum has overtaken those who do not for the first time, a YouGov poll for The Times shows.

Voters have not changed sides over the question of EU membership in significant enough numbers to be sure that the result would be different from 2016, however.

Support for a second referendum has been steadily increasing in the face of parliamentary deadlock, anger among Brexiteers and the rejection by Brussels of large parts of Theresa May’s Chequers plan.

Voters were asked whether there should be a second referendum on the final terms of any Brexit deal. In the poll of 1,653 UK adults conducted on Wednesday and Thursday this week 42 per cent said there should be a