Former Prime Minister Gordon Brown has outlined his plan for a constitutional convention in the wake of the Brexit vote, with new powers handed to nations and regions.

He said he wanted to see a "more federal constitution" and said Scottish politics risked being deadlocked in a "groundhog decade."

In a speech at the Fabian Society on Thursday, he said the Labour opposition should support the proposal.

Powers over agriculture, fisheries and regional development, which the EU currently holds, should be "repatriated" to Scotland, Wales and the English regions, he said.

The former Labour leader stood down as an MP in 2015 after his election defeat in 2010.

Brown said: "We need wholesale reform because today the United Kingdom appears united in name only.

"Politically, the strains of Brexit are already showing, as different nations, regions, sectors and companies desperately seek their own opt-outs from a hard Brexit and call for their own a la carte version of Brexit.

"Economically, the vote on June 23 revealed that Britain is becoming two nations divided - a highly-prosperous south east and a permanently struggling north - with London effectively decoupling from the economy of the rest of the UK."

He said the UK needed to be "reimagined" for new times.

The former Prime Minister called on Jeremy Corbyn's opposition to put the case for a convention to the UK Government.

He said: "The government should be asked by the Labour opposition to sponsor a convention.

"If they fail to respond - as happened in Scotland in 1989 - then Labour and the other political parties should come behind a convention with a remit to engage people outside traditional political parties."

He set out a seven-point plan for issues the convention should look at, including how the UK's nations and regions could have their own relationships with Europe and an "international presence".

A new funding deal would also be needed, he suggested, but the Barnett formula for allocating funds would should not be removed.

An elected senate to replace the House of Lords should also be considered, Brown said.

The convention would be an opportunity for Scotland, he said, and a more federal approach would have the support of around 80% of people in Scotland.

He said: "As the stalemate between the extremes of the SNP and the Tories continues, Scotland risks not just a groundhog day but a groundhog decade.

"The SNP Government in Edinburgh wants our country to be in Europe but not in Britain, while the Conservative Government at Westminster wants us to be in Britain but not in Europe."

He concluded: "The alternative is a Britain that looks in on itself without the means to bridge its divisions and to bring people together.

"It is time to build a fairer, more federal Britain - a Britain we can all believe in."