N
To be fair the METO have been saying it will get very in the extended forecast since December and.....it never quite arrives!
The cold was always forecast for the middle January onwards, as is highlighted in the extended outlook from the 1st of January
“UK Outlook for Wednesday 16 Jan 2019 to Wednesday 30 Jan 2019:
It is likely start unsettled across most areas at first, with perhaps heavy rain and gales at times, especially in the north, where severe gales are possible. Hill snow is also possible, as well as snow to lower levels at times in the north. By the third week of January there is then an increased likelihood of a change to much colder weather generally, bringing an enhanced risk of frost, fog and snow. These conditions may then continue to the end of the month, but some milder, wet and windy interludes also remain possible throughout this period.”
Considering the timescale and model uncertainty that was a pretty good call (including the low level snow there has been in parts of the north).