Latest polls reveal small lead for Remain

Of the 1,001 people interviewed by Survation, on behalf of The Mail on Sunday, a majority of 45% of respondents said they backed the option of the UK remaining inside the European Union, versus 42.0% who favoured 'Leave'.

Another poll carried out by YouGov for The Sunday Times, a third of which was conducted before the death of Ms. Cox, put support for 'Remain' at 44.0% and that for 'Leave' at 43.0%.

On Sunday, in a letter to The Sun 37 executives, including the boss of Patisserie Holdings, Luke Johnson, said small businesses would thrive after leaving behind the "straitjacket" imposed by Brussels.

In an article penned by Cox for The Mail on Sunday, four days before her death, the MP called on voters not to "fall for the spin” that voting to exit the European Union would resolve immigration.

“We can do far more to address both the level and impact of immigration while remaining in the EU,” she said.

On Saturday, Cameron wrote in The Daily Telegraph said quitting the EU would trigger a probable recession and there would be "no going back".

“If you’re not sure, don’t take the risk of leaving,” he said.

“If you don’t know, don’t go.”

In an interview with the same newspaper, also on Saturday, Vote 'Leave' leader Michael Gove claimed the UK would not fall into a recession as a result of Brexit and urged Britons to "vote for hope".

Britain would be better placed to cope with the challenges of global economic disruption if it took back full control over its own affairs, he said.