We've got Zen Internet. They require a BT phone line, unfortunately, and our cable is so old we're lucky to get 1Mbit/sec out of it. Eagerly awaiting ADSL2...
The reason we didn't go for Telewest or whatever is that Zen gives us our own 3-bit subnet for free. This includes the router IP, the broadcast address and the subnet address, though, so practically speaking we only have 5 usable IPs, but that does mean one each plus one for my server.
IIRC, most other ISPs charge through the nose for unique IPs if they even provide the option. Not only that, you always get a whole load of bull**** like X megs of webspace (on a crap server that doesn't even support PHP) along with your Internet connection and the free modem always sucks.
So although we're paying £30 a month for a 1Mbit connection, we do at least get to run our network the way we want. Zen provides the bandwidth and the basic info we need to configure our router's WAN interface, then steps aside and lets us do the rest. Although they do provide network hardware if we want it, we thought it best to buy our own kit. That decision has paid off, I think.
Zen is probably one of the few remaining IAPs out there...
