Britain's political party leaders are set to make their last pitch for votes on a final gruelling day of campaigning before the general election on Thursday.

Current favorite David Cameron will return to his Witney constituency tonight and bring to an end his 36-hour non-stop tour.

So far, he has held a rally in Scotland, bought fish and chips in Cumbria and met firefighters in Carlisle. Overnight he visited Darwen, Wakefield and Grimbsy and the only break in his schedule was between about 6:30 and 9 a.m.

The Conservative leader said the election was still too close to call and encouraged activists to use every second they had left to fight for a Tory victory.

About 120 miles south in Manchester, Prime Minister Gordon Brown used a rally to appeal to disenchanted Labour voters to "come home."

He was speaking in the same Granada studios where the first TV leaders' debate took place three weeks ago.

Brown visited steelworkers working a nightshift in Sheffield and started his day meeting market workers in Leeds.

The PM will later visit a factory in Wakefield before the final day of his campaign for re-election culminates back home in his Scottish seat.

Liberal Democrat leader Nick Clegg will later return to his Sheffield constituency after pushing for votes in the traditionally solid Labour territory of Glasgow North.

His campaign will also stop in Eastbourne, Durham and Sheffield.

He urged the public to avoid tactical voting and back the Lib Dems in what he described as the "vital last crucial hours" before polling day.

Labour appeared to be in disagreement over strategic votes, after Cabinet ministers Ed Balls and Peter Hain appeared to encourage the public to switch votes to prevent a Tory majority.

Current polling figures show Cameron's Conservatives remain on course to be the largest vote winners, but will fall short of an overall majority.

Click here to read more on this story from Sky News.