Weeksy, thanks for the heads up re: sprocket carrier.
I've just ordered one with 37 tooth sprocket and new set of cush drives.
First time i've dealt with AJRacing but he sounds very knowledgeable and a thoroughly decent lad to deal with.
Recommended.
One thing though.
I too was under the impression Renthal sprox would fit the £60 carrier but they do not.
However, he stocks the sprockets that do fit and they're priced at £18 + vat - cheaper than Renthal anyway!