Heavy snow is sweeping eastwards across the UK, disrupting travel and leaving around 100 drivers stuck on a major trunk road in Cornwall.
The South West is worst affected - with teenage students at one college in Bodmin having to stay there overnight.
The freezing weather is moving across southern England and Wales, affecting Wiltshire, Hampshire, Sussex and Kent.
There are warnings of rail delays and flights cancellations into Friday morning.
The Met Office has warned of "treacherous driving conditions" in some southern areas.