11.30am: Nigel Farage brandished his passport with EU markings during an appearance in London

10.30am: David Cameron was in Bristol at a rally with former Prime Minister Sir John Major and Labour's Harriet Harman

Sir John took a swipe at Mr Johnson and Michael Gove, branding them the 'gravediggers of our prosperity'

10am: Mr Cameron and Mrs Harman went to the offices of sports distribution firm Shiner in Bristol

He said: 'In return for doing that he has faced a great deal of opposition and sometimes abuse from people who, frankly, we might have expected better from.

'I think the way in which he has conducted himself in putting the country before self and the country before party is quite remarkable.'

Mr Johnson, however, said it was 'time to break away from the failing and dysfunctional EU system', telling activists in Maldon, Essex: 'I do think that we are on the verge, possibly, of an extraordinary event in the history of our country and indeed in the whole of Europe.

'It's all going to be about getting our supporters out to vote and if we do it I really think tomorrow can be independence day.'

Criss-crossing the country by plane, Mr Johnson signed autographs and posed for selfies in Ashby-de-la-Zouch.