The United Kingdom's political leaders are crisscrossing the country on the final day of general election campaigning, as a key poll showed the outcome could be hanging in the balance.

Conservative Prime Minister Boris Johnson and Labour main opposition leader Jeremy Corbyn were set for whistlestop tours on Wednesday of key battleground seats in a frantic last push for votes.

Polls are cautiously predicting victory for current Prime Minister Boris Johnson, but there is still the chance of a hung parliament.

Al Jazeera's Laurence Lee reports.

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