I have one of these, it's really good, small enough and lightweight enough to carry but really sturdy.
I've had my 60D and a 5D2 on this. £43, although I got mine in the sale for about £35 earlier in the year.
Manfrotto MKC3-P02Ok, just re-read your post, so you have one day to buy it.
Where are you, Surrey?
If you can get to a Jessops.....
Jessops Store Finderyou could get one of these:
Velbon DF61 £40Currys also stock this Velbon for £28
Or get a better Manfrotto
MKC3-H01 £50Or you could get the same Manfrotto from Currys for £40
HereVelbon are decent enough budget tripods, but since the Manfrotto are in the same price bracket, I'd go for those if you can.
The only issue is that they may not have these exact models in store.
If you were going into London at any point, I would suggest going to London Camera Exchange (The Strand) or Camera World (near Oxford Street) or Calumet (behind Euston station).