May I suggest KJN. Not Bosch, but it will do. Made mine from KJN stuff
http://www.kjnltd.co.uk/
You may!
I've actually been looking through their site already but just by chance because I found them on google. Good to know they come recommended
@PhilDAS started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
May I suggest KJN. Not Bosch, but it will do. Made mine from KJN stuff
http://www.kjnltd.co.uk/