Done a search on this and seems as usual there is a problem with camber when lowering . Adjustables sort this! Problem is mine is standard ride height,standard rims and is running bad negative camber to the point were the inner 60mm of the tyres are slicking out with thousands of miles left on the rest of them. I know it can run out with age and a mechanic friend has suggested that if it is original front shockes and springs they may just be knackered and causing the problem. Anyone think this is correct or is there a more sinister problem going on?

sounds like tired bushes and springs mate. Either that or your wheels are toeing out ? try getting tracking done. If not i would suggest new springs aswell as adjustables.

Note of caution: If your ride gets -really- bumpy after 55mph it could mean your tyres are warped. Happened to my front tyres as they had really uneven wear - totaly worn and worse on the inside and fine on teh outside.