update
Problem solved (for the moment anyway!)
I found a tip on BMWland (i think) which seems to have solved the problem.
This involved car stationary,engine running, closing all the windows etc,opening all the vents and running the aircon on max temp full power for 30 mins.Of course muggins here forgot about it and the car was running for an hour.However,no more smells!
So I assume this was a bacteria problem within the aircon system,or within the micro filter.Not sure which.Which ever one it's saved me an expensive fix at the dealership,for which I'm grateful.
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