A campaigner for 'Vote Leave', the official 'Leave' campaign organisation, holds a placard during a rally for 'Britain Stronger in Europe', the official 'Remain' campaign group seeking to a avoid Brexit, ahead of the the forthcoming EU referendum, in Hyde Park in London on June 19, 2016.
The International Monetary Fund (IMF) warned last week that if Britain votes to exit the European Union on June 23, it could deal the economy a "negative and substantial" blow. / AFP / BEN STANSALL        (Photo credit should read BEN STANSALL/AFP via Getty Images)