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This is kind of what I was originally thinking, but then I noticed the drips from underneath the hot and cold handles (mist be a better word for this, bit sure what it is) i.e. it's leaking both above and below the sink (see first picture).
This makes me wonder how much effort it's worth trying to fix it at all. It looks visually similar to the cheapest kitchen mixer I can see at Screwfix, which is about £40
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These are decent if it's within your budget. They are well made, decent chrome and should be durable.
https://www.screwfix.com/p/hansgrohe-vernis-blend-m35-kitchen-mono-mixer-tap-chrome/294vk
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I’m a fool who will tinker on the cheapest things just to learn how to fix a thing - guaranteed to lead to diminishing returns 😂
I would still change the cartridges as they are a few £’s from Screwfix and it may solve the problem.
I’m not quite sure what could be going on underneath the sink as it could only be the tails…
Replacing a cartridge is cheap and simple. You might also find it’s the washer on that actual faucet not the cartridge. I changed both to solve a leak but not sure which one actually solved it.
Is the tap tightened enough on the sink? You may get some residual leaks coming through from above? If it is I would remove the tails as the isolator, tighten up and put them back in just incase something’s made itself loose.