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If you can measure it, you can replace it
https://www.plumbers-mate-sales.co.uk/replacement-brass-valve-ceramic-disc-cartridges-130-c.asp
Soaking in citric acid / some other acid will remove the limescale, and you can replace the o-ring easily enough too. If there's crap on the ceramic discs, 1000 grit wet & dry can clean it up.
Basic plumbing SOS. Got a leaky tap. Opened it up, extracted cartridge, toddled along to local plumbing supplies expecting to be rewarded with a simple purchase/fix and to bathe in the warm glow of a DIY job done competently. Which is a glow I am not hugely accustomed to. The grumpy plumbing man took one look at the cartridge and just said 'no'. Apparently it's really unusual and they don't stock any. I asked if he could advise any search terms/specs to help me find online. "no". He just said do a google and find a picture that looks the same. Having been through all results on ebay+amazon I can't find a match. Anyone able to ID or offer suggestions of what to look for/where to look? Cheers