DON'T worry it's not Dementors that are adding to the Hallowe'en spooks, it's just a touch of fog.

The Met Office has issued a yellow warning of fog across the South West, including in Somerset and Devon.

A spokesperson for the Met Office said: "Fog will form on Monday evening, lasting until mid-morning in the south.

"Please be aware of the risk of disruption to transport.

"With largely clear skies and light winds patchy fog will soon begin to form on Monday evening and become widespread overnight into Tuesday morning with visibility down to 50-100m in places."