Just another quick update. Video of my engine tappy/rattling/clonking whatever you wanna call it is here :
http://bit.ly/7V0jw
BMW Battersea have just phoned me and now admits the engine does not sound healthy at all ... At least now they admit it. They seem to be unsure of what the problem is, so they called BMW technical services who requested they take the whole engine apart to start looking for the fault ... they can't tell me how long that will take.
Like I said, at least they admit there is something wrong, not happy that I'm without a bike for a few days, but happy they are now at least taking it seriously
Will let you know what the outcome is ...