 Airports including Heathrow Airport closed some its runways for a time, with Gatwick also cancelling a number of flights.A minimum temperature of -19.6 °C was recorded in Shawbury, Shropshire.And a minimum temperature of -17.6 °C was recorded at Castlederg, a new record for Northern Ireland and -19.6 °C was recorded at Chesham, Buckinghamshire.