UK weather: Why is the weather so warm in February?

Everyone is talking about the weather and history was made this week when the thermometer reached 20C. This is the first time it has ever happened in winter since records began.

The temperature reached 20.3 °C at Trawsgoed, Ceredigion.

It has been 10 degrees higher than usual for this time of year. This is in sharp contrast to this time last year when we were all freezing because of the Beast from the East