I'd hope so!
I would say between 26th-28th we won't be using the word mild that much, perhaps the word cool. As for 28th onwards, it looks like a return to mild and wet although that won't matter for me since I will be up in the Alpes until 6th Jan
Back here though, ECM showed a little turn for a bit of cooler weather in the first few days of the new year though, most likely won't materialize though judging by the lack of support from other models.
The model watch from around the 27th onwards might be much more interesting as by then we will be watching the outputs up to around the 10th January, and if we want a notable colder spell in January, in my opinion we need to be seeing the signs very early on. (I mention 10th January because a lot of people are hinting cooler conditions as we progress through the second week).
To put it in another way, if in a weeks time or so (New Years Eve), there is nothing cold showing on the outputs, then we'd probably have to rule out anything cold happening before Mid Month, I say this because the Atlantic will just keep eating away. A pattern change is always possible though