Over here, Birdwatch Ireland carry out a similar thing which lasts 13 weeks running from early December through to the end of February, which I've been participating in.
So far today, the following have all landed and/or fed in our garden:-
4 Great Tits
4 Coal Tits
4 Blue Tits
7 Blackbirds (I've never had so many in the garden!)
2 Song Thrushes
6 Long Tailed Tits
1 Grey Squirrel & 1 Rat
(okay I know the last 2 don't count!)
There's still a couple of hours daylight left so I'm still hoping for the Siskin or the Greenfinches to come back.
I'll post the list that my mum does over the weekend so I can see the differences between her garden (which has no grass, is landscaped with a few ferns & has lots of cats in the neighbourhood) and mine (which backs onto a small wooded area, plenty of cover & trees etc).
Hmmmm wonder which one will have the most birds?
Not that I'm competitive or anything!