It's back in with BMW at the moment. They have replaced the timing chain and fitted the new 'Enhancement' casing to prevent it happening again but are saying its still not sounding great which means likely damage to other parts of the engine due to the timing slip..camshaft/pistons etc?? They are supposed to be re-diagnosing it on Monday. I'm no mechanic so I'm taking thier word for it but it sounds as if it is getting more costly by the minute. My argument is shouldn't the 'Enhancement' have been carried out before I bought it off them in September 2010 when they serviced it before re-selling it as they were aware of the problem before selling it on as an approved used car? I think i have a good case for BMW to look at some kind of goodwill gesture as even £1200 Is £1200 too much for a car I bought off them 13 months ago!!