Most ISPs don't do static. Somewhere on here was the same question last week (can't remember which forum it was, probably which residential ISP).
Upshot was that Plusnet do them for a one off payment of £5. I think Vivaciti said they do as well. Barring Plusnet it is mostly either smaller ISPs that do static, large ISPs often only have static on business products.
EDIT : Memory was not failing me, it is the top article at the moment in Which ISP (Residential) - thread is here
Edited by ian72 (Mon 05-Aug-13 13:28:59)