Yes that is a bit of a concern... although it took them long enough to even mention colder weather at all: as of Xmas they said:
UK Outlook for Saturday 9 Jan 2016 to Saturday 23 Jan 2016:
The middle part of January is expected to start unsettled, mild and windy at times, with mainly westerly winds. The wettest and windiest weather is likely to occur in the north and west where it is likely to be wetter than average, although parts of the southeast may be slightly drier than average. Temperatures will generally be above average, with any snowfall likely to be confined to the north. Around the middle of the month there are signs that it will become somewhat drier, especially in the south and east. Later in the month there are weak signals the wind will turn more northwesterly, allowing temperatures to return to near normal, but the chance of a prolonged cold spells remains low.
Originally Posted by: Rob K