Latest Outlook from the metoffice ~ sounds like they're 'covering all bases' to me!...
UK Outlook for Monday 7 Jan 2019 to Wednesday 16 Jan 2019:
Most places are likely to stay dry but rather cloudy through next week. The cloudiest and mildest weather is likely to be in the northwest, where it will be cloudy enough for some drizzle over the hills, and sometimes rather windy. In the south, winds will stay light and there is a greater chance of sunny spells, but also a greater likelihood of overnight frost and fog. Where fog does form, it may be slow to clear during the day. By the end of the week a change to wetter and windier weather is likely, particularly in the north. There is a risk of snow on hills in the north, and perhaps to lower levels at times too. In the south, night frost and fog will become less likely.
UK Outlook for Thursday 17 Jan 2019 to Thursday 31 Jan 2019:
Most of the UK is likely to start this period with predominantly wet and windy weather, and a chance of heavy rain and gales at times, especially in the north. Hill snow is also possible, as well as snow to lower levels at times in the north. In the south though, the weather is likely to be on the mild side. Towards the end of January, however, there is an increased likelihood of a change to much colder weather generally, bringing an enhanced risk of frost, fog and snow. This cold spell is by no means certain though, and in any case, some milder, wet and windy interludes are likely during this period.