Thanks again for all the ideas and advice, everyone. Good news... couple of days ago I replaced the rear lower link-to-chassis bushes ( I was going to do the axle ends as well but they looked almost like new) and it's completely fixed the problem.
I'm not surprised, looking at the state of the old left hand one particularly - literally shattered. (well as shattered as rubber can be) I'm ashamed I didn't realise it was so bad a lot earlier TBH. Anyway, that's one issue fixed. Only the other 6 or so to sort now.....
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