The ECU is definitely black and has the 'YWC105180' code printed on it. Seems to indicate, therefore, that it is indeed the earlier system with the separate speaker, located under the rear parcel shelf.
On that basis the problem may therefore be that the speaker is at fault. Can’t say that I ever bothered to listen to where the beeping was coming from. Next step to try and track that down, although it looks a job-and-a-half to get to the thing.
Many thanks for your reply; any other comments/guidance from anyone most welcome!
Will report back in due course...
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