'Dial-in' to a VPN pool is the usual way of dealing with dynamic IPs, however if there's no VPN which is the implication here options are a bit limited.
A few services are quite happy to give statics though.
http://www.zen.co.uk
http://www.hi-velocity.it
http://www.f2s.co.uk
Amongst others.
Check
http://www.adslguide.org.uk for more information on these and other DSL ISPs.