I know I can't really but I'm just dead annoyed. Dh has a small income from rent and so pays a correspondingly small amount of tax on it.
HMRC in their infinite wisdom have decided they want more than he paid in total for 06-07 on account for 07-08. Oh, and they wanted some of it in April (although didn't tell me) so are charging interest on that amount already.
As far as I can see, this means they get to reap the interest on the sum for the whole of the rest of the tax year, just for fun.