How it started:
Yes, the trigger to get me to finally do the job was the total failure of the trailing arm bush - though interestingly, the rubber part was SOLID (survived hammering the bush out). It was the metal bar that failed and it must have been failing for years. The passenger side bush looked awful, but again was SOLID - the arm itself even surviving being used to hammer the bush out of the arm.
The compensator adjustment bolt below. I was told this wouldn't come out by the garage. I removed it using a normal ratchet 🤷♂️🤷♂️
However.. this is RYG10031: the middle bolt came off the passenger side easily. The bottom one is a correct-grade bolt I was going to use. The top one is the original RYG10031 stuck inside bush RGX100351, which we had to weld a nut on to undo then just cut out anyway.
Lots of bodywork prep and rust treatment while I had access. All solid (except that exhaust heatshield on the left).
Suspension components treated then primed.
Wire bushed (by hand, by drill attachment and by angle-grinder-death-spinner), then treated with Kurust, zinc primed, primed and painted black. Lots of layers.
Trailing arm bush location.
The easiest step was changing the bushes. I used a cheap bolt-based press off eBay. This was the first bush I've pressed out and in - I was sure it would be rusted in or otherwise stuck, but it just pressed out and in easily.
I haven't put the new trailing arm bushes in, yet.. but I do have the proper tool to do it.