My first port of call was Asda, but obviously they had sold out as all the smart people had bought them a week before when snow was first predicted. Office was the only place I found with the widest range of "fashionable" wellies for under £30. I wanted these blue snowflakes ones but they didn't have any in my size so I settled for this gold flock printed pair.
They don't have as much grip as knee high wellies but they are comfortable and keep my feet warm and dry. Affordable at £15 too. I'm a size 6.5 and the 6 was slightly too big but nothing that can't be rectified with a thick pair of socks.

Here's a crappy phone pic of me wearing them, obviously looking full of Christmas spirit and cheer(!!).
The great thing is that they don't look like traditional green wellington boots and I can easily incorporate them into anything I wear (I do wear a lot of black). These biker style wellies actually look like a proper pair of boots!
I haven't worn wellies since I was a kid and it felt really strange walking in them. I did however take great relish splashing in a big puddle when no one was looking :D
What have you been wearing in the snow?