What to expect from the final showdown — European Union referendum debates

Daily Politics reporter Adam Fleming popped into the huge space to see what was going on behind the scenes in the run-up to tonight’s debate chaired by David Dimbleby.

Boris Johnson was accused of pedalling “project hate” by Saddiq Khan, the man who succeeded him as London Mayor, while Scottish Conservative leader Ruth Davidson accused fellowTory Andrea Leadsom of lying about how many rules and regulations come from Brussels.

As Leave campaigners accused the Remain campaign of “Project Fear” over the economy, London mayor Sadiq Khan said the Leave campaign was pursuing “Project Hate” over immigration.

Both sides of the debate will make opening and closing statements.

Mr Johnson criticised the European troops’ failure to stop the massacres during the Balkans wars which left 140,000 people dead and many more displaced.

Representing leave on the second stage will be Conservative Minister Priti Patel MP, UKIP’s Diane James MEP, Harsimrat Kaur from Women for Britain, Tim Martin, founder and chairman of Wetherspoons, and journalist and author Tony Parsons.

The debate was the final major TV event before voters go to the polls on June 23, with the final campaign day tomorrow.

Sparks are likely to fly between Davidson and Johnson, after reports suggested she believes her party would have to break away from Westminster Conservatives if Johnson became prime minister.

Davidson has not been shy in expressing her opinions about the bombastic Brexiter and his fellow campaigners.

She said that while she had deep respect for military figures like Field Marshal Lord Guthrie, the former Chief of the Defence Staff, who backs Brexit, current military chiefs are united in opposing it.

The BBC’s Great Debate featured nearly two hours of questions on immigration, the economy and sovereignty.