The Mayor of London will announce his chosen hub airport options for submission to the Davies Commission on the future of aviation capacity in the UK this morning.
According to a report in The Telegraph, Boris Johnson will reveal that he believes a new airport on the Isle of Grain in North Kent has the "greatest potential."
The move could put the mayor on a collision course with David Cameron, who removed Transport Secretary Justine Greening from her position last year after she campaigned against expansion at Heathrow.
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South-east England will hold on to the cloud for longest, although the rain will gradually be easing through the afternoon.