The ex-mayor of London then headed north, visiting Selby and Darlington before signing off his campaign.

Labour leader Jeremy Corbyn addressed activists in central London, while planes trailing Remain banners staged a flypast at the Houses of Parliament.

During the rally in Bristol, Mr Cameron urged voters to stick with Brussels to ensure a 'bigger better Britain'.

He rejected Leave claims that Britain would be 'shackled to a corpse' if it chose to stick in the EU, telling supporters in Bristol the Remain case could be summed up in the single word: 'Together'.

2.30pm: The Vote Leave campaign arrived in Selby, North Yorkshire as Boris Johnson pressed the case for Brexit with just a few hours until the polls opened

2.19pm: Planes carrying pro-Remain banners staged a fly-past at the Houses of Parliament this afternoon

2pm: David Cameron and Harriet Harman met farmer David Christensen on Kington Hill Farm in Abingdon, Oxfordshire as he continued his campaign this afternoon

CAMERON INSISTS IMMIGRATION CAN BE CURBED WITHIN THE EU DESPITE NEAR-RECORD FIGURES IN BAD-TEMPERED INTERVIEW

David Cameron has blamed mass immigration on our 'unnatural' economy as he insisted numbers will be curbed if we stay in the EU.

As the referendum campaign entered its final frantic hours, the Prime Minister said freedom of movement rules will be re-examined if we stay in the bloc.

He defended his target of bringing net migration down from around 330,000 a year to below 100,000 as 'realistic', and also denied that being in the Brussels club was like being 'shackled to a corpse'.

The claims came as both sides in the bitter campaign stepped up their efforts on the eve of the crucial ballot.

In a bad-tempered interview in BBC Radio 4's Today programme, Mr Cameron said immigration had been stubbornly running at around three times his target over recent years because it was 'not a normal period'.

'As recently as 2008, if you look at the situation of British people and European nationals leaving Britain to go to Europe and European nationals coming to Britain, there was actually net negative migration in terms of Europe,' he said.

'If we want a bigger economy and more jobs, we are better if we do it together,' the PM said.

'If we want to fight climate change, we are better if we do it together. If we want to win against the terrorists and keep our country safe, we are better if we do it together.'

Sir John took a swipe at Mr Johnson and Justice Secretary Michael Gove as 'gravediggers of our prosperity', suggesting he had 'expected better' from them.

Quitting the EU would not stem immigration and risked creating a broken Britain, he insisted.

Leaving would be a 'disproportionate' response to migration concerns and the country would live to regret it for a 'long time to come'.