Right, after riding another 60 miles I can give a better description of it. You know the feeling the bike gives if you're braking hard and coming down through the gears and you can feel the back end snaking around a bit as the back wheel skids about? It feels very similar to that but I don't think the wheel is locking (not sure though). It doesn't do it with the clutch in so it's not the brakes binding...
It's bloody annoying and probably a trip to a garage but If you've any ideas I'd really appreciate it.
Thanks.
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