OK, the mystery is now resolved.
The garage diagnosed a worn OSF wheel bearing and replaced it.
No more noises, fuel consumption is back up where it should be and I am a happy man.
The odd thing is that not only did it not sound like a worn wheel bearing, but it was the same one that was replaced about 3 years ago, so it had only lasted about 35k.
The garage did think it was not a Volvo OEM part, so not sure if the garage that did the work did not use a quality part.
Still, I now have my smooth running, 6 cyl 3.2 cruiser back in tip top condition.
I did speak to the owner at Hortons just outside Thame and he was a big advocate of the ATF change, and they don't seem too expensive. Hence, I think I will pencil it in for late July/early August.
You live and learn
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