Try B&C Express in Lincoln

http://www.bandcexpress.co.uk/

It's worth ringing them though, as they can get hold of stuff thats not on the web site. They can also machine sprockets to order. They made me a selection for racing, and they were very reasonably priced.

They are very friendly and helpful as well.
_________________
Please visit my NSR race site

www.chappyracing.co.uk