It does help a lot, thank you!
The Vector B (same rear suspension.) forums seem to suggest the best method is to grab the wheel at 12 o'clock, with the car on the ground, and see if you can feel any movement. I can't. Also, as you put it, any motion I saw with the wheel off the ground sprung back when I released it.
I don't think there's anything wrong with the rose bushes. A trusted mechanic told me as much about a month ago so I really should have stopped there
Having read the rear toe adjustment procedure in WIS which basically involves shifting the position of the bracket that holds the trailing arm bush whilst holding the longitudinal links with a special tool. I do wonder if when the trailing arm bushes were changed, the rear toe was set correctly using this procedure?
Next step is obviously a 4 wheel alignment but I need to find an establishment that has the wherewithal to do the rear toe..
Thank you both again for your help