A yellow weather warning for fog has been issued for parts of England on Friday.
The Met Office warned of possible delays to journeys during the morning rush hour and the potential for flights to be delayed or cancelled.
The warning was issued for parts of the East Midlands, Suffolk, south-east and south-west until 10am.
The Met said the fog would slowly clear with Friday set to bring mild temperatures for many, with highs of 13C in London, 15C in Leeds, 14C in Edinburgh and 16C in Aberystwyth.
Thursday was the warmest ever February day in Scotland, as Aboyne in Aberdeenshire hit a maximum temperature of 18.3C on Thursday afternoon.
It beats the previous high of 17.9C recorded in Aberdeen on 22 February 1897.