I think it's pointless looking backwards because CC has, and is accelerating at such a rate now, history is meaningless - even history as recent as the 60s, 70s and 80s.
Watching the MOD threads over the winter, and one thing keeps popping up over and over - "Iberian heights". Persistent high pressure to our south has more or less removed any chance of deep cold reaching the UK, either from the North or the East.
If you want to experience winter weather in the UK, as your Christmas cards want to paint it, you need to visit Northern Scandinavia, or Northern Canada.
TL;DR @northwestsnow is right.