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Thank you John, I will try/check those suggestions and see how I get on.

Thanks snb. basin tap is very hot and runs without going cold. So I'm fairly convinced its a problem with the shower thermostatic valve, but I'd love to be able to test this without removing it because the stainless cover/panel that needs to be removed to extract the thermostatic valve is glued...

I have a shower with a thermostatic valve driven by a combi boiler. Its worked fine for a few years. Recently it has had temperature and flow rate fluctuations. I hope someone can advise me. More detail follows (look away now if you're not interested): When I turn on the shower it has a...