I took the engine out to get to the hand brake cable.
Actually, there are 2 x C clips holding the single cable in place in the Y of the chassic. You need amazing dexterity to get to these C clips. I had one of the steel radiator tubes out to get to them.
As for the U clamp, once you unclip the 2 x C clips, the cable can be fed up into the box between the seats, under your elbow, and then you can prise open the U clamp on a work bench with a metal chisel and hammer, and then use a vice to clamp it on the new cable.
Getting the C clips back again is a challenge.
Getting the spring from the U to the chassis bin the Y is f'ing near impossible.
Getting the bolt back in holding the reaction level to the chassis is also f'ing near impossible. I used a length of wire around the lever with the cable already attached to it, threaded the wire through to the front where the spare wheel is kept, kept the wire tight with a long piece of wood, then tensioning the wood with my leg, I managed to get that sleeved bolt through the lever back into its place on the chassis. Don't forget the washers on that sleeved bolt. That took me 2 days to work out.
HTF they did that on the moving production line ..... maybe it was installed before the body went on the chassis, maybe they had 6 year old children with thin arms, maybe they had some ingenious device.
Have a first aid kit ready to deal with cut fingers and hands.
Good luck, and make sure when you do this, you are in a good mood and have plenty of patience. Therapeutic music in the background helps !