Hiya
We chose F&C (Foreign and Colonial) for ours - we invested #2 son's £250 there in July 2005, plus £300 for #1 son (who was born before CTF). I don't have #2 son's statement to hand, but #1 son's arrived yesterday and is now worth (after only 2 years' growth) £418.99 - I thought that was pretty good!
HTH
Shel