Thanks!! Yep, have heard about that especially with regards to the E46 diesel engines. Speaking to a few people locally it seems that the chirp noise that I was hearing is most likely the fan belt which slips on start and stopping the engine, and apparently fairly common, so not really something to worry about.
Was very impressed with the overall feel of it!!
BMW E90 330i (M) '05 (His) | (Hers) BMW E46 320i f/l (M) '03