Braved the cold today and finished the back...that was around 4-5 hours work today but it's great to at last finish the whole rear beam bushes job, and the disc conversion.
Really painful top tip - I usually do any nuts up tight as I go along. However, when I came to bleed the left rear brake, I was pumping forever with the one man kit, pumping the brake pedal and still getting loads of air. Sadly when I looked under the car I saw why... a puddle of brake fluid.
Firstly the hose connecting to the trailing arm was way too loose, so tightend that. Tried again. To my utter horror, I saw that the same hose was not tight enough going to the brake pipe. This was seriously bad news, as the beam is in the way. I had images of having to take the whole lot back off again, after 2 weekends of putting it back on... Fortunately, you can just about get two spanners in front of the beam, so I nipped the connection tight - very tricky with no room and baltic cold hands! But no more leaking.
I'm still getting what seems to be air though, so I tried the other (driver's) side. This was much simpler. (Possibly because a fellow zoner did part of that side for me....) I bled the fronts - much simpler as they also have one way speed bleeder valves. I will go back to the left rear, when I actually have the correct size spanner too. It's a 7mm bleed valve for some reason.
The suspension looks very low and odd on one side, but thinking about it the old trailing arms and beam plus trolley jack are in the boot.
And there we go! She's back on 4 wheels. Very carefully moved it back and forth, worryingly it seemed to snag and go up slightly.. balls!!! What have I done.... Clearly something catastrophic like the drum brakes are on back to front, or the driveshafts are getting snagged, something's broken etc. I'm very worried at this point.
Raised the back on the diff and put in to first gear, okay so the wheels are moving fine - right faster than left but all ok. So what's going on?
Turns out the wheel chocks were still in front of the front wheels 
So after (removing the chocks and) very carefully trying the brakes and steering (which is now much nicer with new fluid I replaced several months back!), I carefully edged on to the cul de sac, literally 20 metres then reversed back. All seems ok. Job done! Sort of...
Next, need to sort out the other handbrake cable, nice and cheap - I'll do that next month. Then I'll clean the interior back up, as there's been lots of rusty parts sat there. I also need to sort out the exhaust mounting more importantly - perhaps a welding job for a garage same time as MOT? I've got the original mount from the other beam it just needs to be attached to this new one. I'm also going to update the chap I bought the car from - he wanted me to keep him posted, and I dare say he might be impressed.