Ice is likely to form on untreated surfaces during Monday night, especially where showers move well inland. Elsewhere, most places will see little or no snow, but a slight covering of a centimeter or so is possible in a few places.
An Atlantic frontal system looks likely to bring rain into parts of southwestern Britain on Wednesday according to The Met Office. As this moves further east into colder air there is a chance of this rain turning to snow.
The Met Office says that the extent of any snow is very uncertain, but 2 to 5 cm could fall across a swathe of southern Wales, central and southern England, with a small chance of 10 to 15 cm settling in a few places, most likely on high ground above 200 metres.
As the rain and snow clears on Wednesday night there is a risk of widespread ice forming on untreated surfaces.