Dont go with Orange! Their almost as bad as Tiscali!
Sorry to say Feckit but that Watchdog survey was not very good as it didn't include half of the ISP's out there.
Gizmo2006, check out
DSLZone, for some customer ratings of the various ISP's out there.
FWIW, i'm with Vivaciti, an Entanet reseller, and the service is the best, I emailed support to get interleaving turned off they replied in less than 5 minutes, and it was done (by BT) the following day.
Do you know what services are available in your area? Or what kinda of speed your after? Check out
Sam Knows for some insight on your lines capability. Any questions you know where to come.