THE Met Office have issued a yellow warning of fog.

Overnight areas of fog and freezing fog have developed, including some dense patches in places.

A spokesman said driving conditions will be difficult with journeys likely to take longer than usual and delays to air travel are possible.

The warning is valid until 10am.

The Met Office chief forecaster said: "Fog and freezing fog patches are locally dense with visibility less than 100 metres in places.

"Combined with sub-zero temperatures, there is also a risk of icy patches on some untreated surfaces.

"This fog will only slowly lift and thin today, likely lingering into the late morning or afternoon in some places, most likely over parts of southeast England."