In the UK, campaigners from both sides of the EU debate have just a day left to persuade voters.
Polls for the referendum open tomorrow morning, as the UK decides whether to remain or leave.
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During a TV debate at Wembley last night, London mayor Sadiq Khan clashed with his predecessor Boris Johnson on the issue of immigration.
Sky's Senior Correspondent Jason Farrell says last-minute efforts could make all the difference.
