LONDON - Flights have been grounded, roads blocked and schools closed in parts of Britain today as deep freeze grips the country with temperatures expected to fall to -11C (12F) and 'very significant snowfall' still on the way.

Manchester Airport was closed this morning as workers desperately tried to clear the runway of snow, with passengers complaining of 'mayhem' as people were stuck on planes and flights redirected to other airports.

Customers complained of a lack of updates on the situation, with one tweeting: 'I'll never understand why airports in Switzerland and Austria all cope with meters of snow and yet Manchester Airport shuts after 5cm of the stuff?'

Liverpool Airport also temporarily halted flights. The airports, which faced disruption despite warnings of snow by the Met Office, both insisted their airfield teams had worked through the night to try to keep the runways clear.

Some 115 schools were closed across Greater Manchester today, mostly due to the dangerous road and pavement conditions - including at least six in each of Bolton, Bury, Oldham and Stockport - plus another 11 in Staffordshire.

Various other schools have closed around the UK today. Much Woolton Catholic Primary School near Liverpool announced its snow day on Twitter, asking for 'creative ideas' to make the most of a blanket covering the grounds.(FA)