The Met Office is predicting that thunderstorms are likely to descend on the UK on polling day in a washout that could boost the Leave campaign.

Weather forecasters have issued yellow and amber warnings for rain and localised flooding in the south east during the day on Thursday, when millions of voters are expected to go to the polls.

The wet outlook, which also extends to the north west of the country, could boost the Leave campaign, which is most likely to benefit from a low turnout on the day, according to polling experts YouGov.