A clear majority of British people want a public vote to break the parliamentary deadlock on Brexit if MPs reject Theresa May's Withdrawal Agreement, according to new research released by campaigners for a second referendum.

Analysis of polling of more than 6,700 people found 60.2 per cent favour a public vote if MPs cannot decide, against 39.8 per cent who oppose it, said the Best for Britain campaign and Hope Not Hate.

Which way forward do you back?

For the first time, the polling - carried out in mid-December and early January - found a majority in favour of a second referendum in every part of Great Britain.

The analysis showed support for a second referendum is particularly high among Labour voters, with a majority in every seat held by Jeremy Corbyn's party.

The findings come as the Labour leader is under pressure to commit his party to a second referendum if he is unable to secure a general election through a no-confidence motion in Mrs May's Government.

The research is based on "multi-level regression and post-stratification analysis" applied by market research company FocalData to two waves of YouGov polling involving a total of 6,785 voters.

Participants were asked whether, if Parliament cannot decide on the best way forward for Brexit, they would favour a public vote with three options - Remain, Leave with Mrs May's deal or Leave with no deal.

Excluding "don't knows", a total of 60.2 per cent favoured a second referendum, with strongest backing in Scotland (67.7), London (67.6), the North West (61.2), Wales (60.3), North East (59.8) and Yorkshire & Humber (58.9).

Highest levels of opposition were recorded in the South West (44.9), East of England (44), East Midlands (43.2), South East (42.2) and West Midlands (42.1).