Well, just a little update for you. The garage did an excellent job. Stripped the carbs and cleaned them, balanced the carbs, put in 4 new plugs and added fual addative. Think it was wurth?! But this stuff is suppossed to be the dogs danglies for cleaning the fuel system. Lots better than redex etc. Anyway, the bike now revs so freely it feels better than new. Big shout out to PGH in devon.