Temperatures could plunge to -5C with a chance of frost as an incoming chill threatens the coldest start to May in Britain for 25 years.
Despite the 23C Easter heatwave, forecasters warned the weather is going "into reverse" in the coming days - and could be colder than Sweden.
Widespread frost is expected across the south and snow flurries in the north thanks to a 100-mile wide 'Russian chill'.
