UK voters would now opt to stay in the EU

Brits are increasingly unsure about the decision to leave the EU, a new poll shows.

Brits are increasingly unsure about the decision to leave the EU, a new poll shows. (AAP)

The British electorate would now vote narrowly to stay in the European Union, according to a BMG poll.

The United Kingdom voted 51.9 per cent to leave the bloc in a June 23 referendum while 48.1 per cent voted to remain.

A poll by BMG Research, showed that when asked if the United Kingdom should stay or go, 45 per cent opted to remain, 43 per cent opted to leave and 12 per cent did not know.

"Rather than people switching to Remain, it looks as if people are now less decisive about whether it was the right decision to leave," Michael Turner, head of research at BMG, told Reuters.

Excluding "don't knows" puts Remain on 51 per cent and Leave on 49 per cent, according to the poll.

The fieldwork was conducted October 19-24 among 1546 adult UK residents.