The Liberal Democrats will pledge to take Britain back into the European Union as part of their next general election campaign.

Brexit's victory on Friday was secured on a campaign of lies, while voters in favour of leave did so in a "howl of anger", according to the party's leader Tim Farron.

"Cheap" slogans of Ukip's Nigel Farage and Tories Boris Johnson and Michael Gove are "unravelling", and the public will feel "betrayed" when promises on the NHS and immigration are not delivered, the Lib Dems said.

Since Friday's result, the party has recorded thousands of voters signing up to become members.

"For many millions of people, this was not just a vote about Europe," Mr Farron said.

"It was a howl of anger at politicians and institutions who they felt they were out of touch and had let them down.

"The British people deserve the chance not to be stuck with the appalling consequences of a Leave campaign that stoked that anger with the lies of Farage, Johnson and Gove.

"The Liberal Democrats will fight the next election on a clear and unequivocal promise to restore British prosperity and role in the world, with the United Kingdom in the European Union, not out.

"If you agree with us, join us to make this happen."

The next general election is not due until 2020 but could be staged within months if the next Conservative leader decides to seek a mandate through a national vote.