Paul Howard Woodturning - Paul sells some interesting jigs - his revolving cup chuck looks useful and won't break the bank!
Ashley Iles Tools- A range of decent quality turning tools supplied with or without handles
Yandles Tools: A broad range of tools for woodworkers including turners
Bedford Saw Company:
UK Workshop Turning Forum - Advice and info on anything and everything related to turning as well as a quarterly competition
Woodturning Online - A site with lots and lots of information and a listing of woodturning clubs
The Association of Woodturners of Great Britain - one year I'll get to their seminar!
Robbie the Woodturner - From Ireland Robbie has some cracking projects including some interesting off centre pieces
Lyle Jamieson - Well thought out videos from a bowl turner and hollower
Sam Angelo - From Wyoming Sam has some good tutorials on chasing threads amongst other things
Tudor Rose - Our neighbouring club in Daventry organises the very excellent annual Woodworks exhibtion in May