m and c express in london do chain and sprockets but i bought a set from them and the chain was fine untill it just all of a sudden it just let go and got longer with every ride. At the moment ive a DID chain and it seems to be holding up rightly.

as for changing the gearing if you want more speed then the cheaper idea would be a 16 tooth from sprocket as its cheaper but ive gone down 2 teeth on the back sprocket (similar to a 16 tooth up front) and it allows you to sit at 75mph (gps) alot better but you do cut a good bit of your acceleration but im not too worried at the moment as im touring but when i get back home i think i will return to the standard gearing

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Plough on