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Have had a lot of success with that kind of deeper logic in the past, you can usually quite easily create such rules using robots.txt wildcards

Hi Robert. I will get the code checked and most probably set that redirect rule indeed. Many thanks for the advice!

That helps a lot indeed! Thank you so much for your reply. I'll get on with this asap

It doesn't rank well at all no. But there is a myriad of other problems making it tricky to understand the impact of that one. <1% is not keyword stuffing indeed but if the keyword targeted and the "noise" created by the prompts and call to actions all over the place is of a comparable volume, what does it tell Google?

Apologies for the delay coming back to you - Christmas didn't help. And thanks for your answer; I will give this specific use of canonical a shot starting with small subsets of the site and monitor the impact on my ranking first. Another interrogation on top of its impact on the site is to know whether it's worth the effort. But I guess I'll only know it by trying directly.

Great, thanks for your note Paul, I will filter through as you suggest!

Thanks Kate, will do the best I can in the light of your answers. But as you've probably understood by now, with quite limited resources.

Thanks Kristina, this is in place now!