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I was trimming some tatty bits off my Kerrria today (pruned it after flowering previously) and noticed it has a lot of brown patches (rust?) on almost all the leaves and also dark brown patches on the stems. Is it on its way out? Any advice welcome.

Spooky! I was going to post the same question....I have three Kerria plants and they are all looking dreadful. I'm inclined to cut them right down to the ground, I mean I don't think anyone has ever managed to kill one...

Sounds like rust

See here; http://www.torontomastergardeners.ca/askagardener/how-to-deal-with-blight-on-kerria-japonica/

Thanks, TeeGee- also found this on RHS;

https://www.rhs.org.uk/Advice/Profile?PID=1018

Thanks TeeGee. Though my heart sinks a bit at the thought of trying to get out all the roots....I've never known a plant like it for surviving, suckering and spreading!

Update on the Kerrias....I thought I had lost them all, everything died right back, but I've just found dozens of new shoots emerging, I don't know whether to be pleased, because I hate plants dying, or disappointed because they are such invasive nuisances!