First of all MEGA thanks to Sassenach for his time and skills this evening.
He disconnected drive shaft, removed caliper, removed disk/drum, then confirmed that there was a nasty noise from the wheel bearing. With a suitable selection of some odd looking, but extremely effective, home made drifts, pullers and the most amazing "slide hammer", the old bearing was out.
New one in, again with a selection of drifts and threaded rods and nuts to pull it in. Disc/drum onto the lathe to remove the corrosion around the lip, and all reassembled ... total time .. 1 hour 40 minutes and that included fetching various tools from around the workshop and the lathe time.
And then he refused to take anything for doing the job, and he's not a man to argue with when he says no........
So, once again, a HUGE thanks. I did take a few photo's that I'll put up later, but nowt like a "how to" as no-one would have the tools and bits and pieces he has !!!
Now the bad news........
The car was lovely and quiet for about 5 miles, then the noise started again, going from "faint" to just as noisy as before in about 2 more miles...
From the drivers seat it still sounds like its from the left rear, it starts at about 20 mph, braking/steering makes no difference.... I might be fooling myself but I'm starting to think that it is less noisy on overrun/very light throttle than it is when under power.
So what could it be ?? The only rotating things left are the drive shaft or the diff ...
Really hacked off now, especially as the old bearing WAS noisy once everything else was disconnected, so it needed changing... but obviously was not the reason for the noise.
Any how .... that does not detract from the excellent work of Sassenach.