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Thank you Mark!

I was hoping there was a simple answer! I should have noticed this, but most of my D4D knowledge comes from looking at the samples and the only one that uses ALast is the AEC_Model sample (and looking at its use there I'm not even sure that it is necessary in that macro!)
... should have read Joe's tutorials (and a couple of posts where he asked questions whilst writing the tutorials)!

I have added the ALast test and my cleanup code is now being called exactly when I want it to be.

David H.