Boris Johnson has warned the general election is “on a knife edge” as the Telegraph’s final poll of the campaign shows that the Conservatives' lead has shrunk to just five per cent.

With the result now “too close to call”, the exclusive Savanta ComRes survey puts the Conservatives on 41 per cent ahead of Labour on 36 per cent, the smallest Tory lead since mid-October.

The result would give the Prime Minister a narrow majority of just six although the poll predicts a hung parliament as a “plausible” outcome.

Issuing a final rallying call as all three party leaders made the final push in what has been dubbed ‘the most important election in a generation’, Mr Johnson said: “This election is our chance to end the gridlock but the result is on a knife-edge."

As he tried to recreate the spirit of 2012 with a final speech at the Copper Box arena in the Olympic Park in Stratford, he issued a last minute appeal to voters, saying: “A great future is there within our grasp, but I need your vote. Even if you have never voted Conservative before, this is your chance to be heard and I promise I will not let you down.