UPDATE
I replied to the offer of 10k on the day I received it 6 weeks ago and heard nothing.
This afternoon I tweeted BA about the lack of a reply and within 3 hours the offer had been upped to 40k Avios.
I consider that to be fair and have accepted it.
Thanks again to everyone who took the time to comment on the thread.
My trip report is nearly ready. It's a video report narrated by me. Not sure if that's a first for this board?