Settled snow turned to treacherous ice in parts of the south east causing disruption on roads and railways across the country as forecasters warned of freezing temperatures.
The deep freeze also saw hundreds of schools close, thousands left without power and flights delayed on Monday, including at Heathrow where passengers have complained of waiting hours for travel to be rescheduled.
The Met Office has extended its yellow weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.
Emergency services warned motorists to drive with caution, even on motorways, with icy slush on the M40 between junctions two and three causing a van to flip over following a collision with two other cars.
A Heathrow spokesman apologised for the continued disruption and said.