OK - quick update (it's bedtime here, 12:42AM)...
I got the driveshaft nut off by myself. With the handbrake on, and first gear engaged, I used an extension tube on 1/2" bar, jumped up and down (as Chas said) - and moved the car backwards and forwards, up and down... I then decided to jam the brake pedal down with the jack handle, as in pic... and then a few more jumps on the (seriously-flexing!) bar got the nut off. Usually I would have an assistant and it would be a lot easier.
Suspension balljoint came off with trusty 'Draper' separator (bought in the UK) and hub came out quite easily but took the outer, inner bearing race with it (if you understand... the inner race of the bearing, the outer of the two bearings...) I think this is inevitable (the inner race staying on the hub) because the only thing keeping it in the bearing is a grease seal.
The inner race was difficult to remove from the hub because there was nothing to pull on or pry against, so I had to use a cold chisel and I burred the hub a little.
With the hub off, only a circlip kept the bearing in place (no large nut on the Turbo)... well, apparently only the circlip...
Removing the outer race of the bearing - oh dear.
Let's just say that any aggression or frustration was long-gone, except perhaps in the minds of the neighbours. I gave up at 9PM - after a couple of hours of solid hits, the bearing had moved about 5mm. I had tried a squeeze with the vice, but that was fruitless.
The following day, I rigged it up on the vice to allow space for the bearing to escape, and gave another hour with the club hammer. The poor old 9/16 Whitworth Britool socket (large, in pics) is unusable as a socket now, as the 1/2" square hole isn't square any more. But I think it's final purpose in life is definitely as a drift-tool. No-one has Whitworth fittings that large anyway?
With the bearing out of the hub carrier and everything cleaned up, it took only a couple of minutes to press the new bearing into the hub carrier and then the new hub into the bearing, and I managed to get this help from Mal Simmonds in Cambridge.
It's easier to reassemble than to remove, as balljoints etc. bolt up easily. And, I've replaced all those in the last two years anyway. I had to wipe some annoying rust-dust off the bottom arm - it had fallen out of the driveshaft splines!
Job done. Much quieter driving down the road now - I didn't realise how noisy the old bearing had been.
Picture 2 below shows some evidence (on the floor) of various leaks from the oil cooler hoses. They've never been completely oil tight ever since I decided to replace the leaking originals with new hoses and high-pressure clips, which leak. But that will be a story for another day...
-Alex