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Thanks. I looked online regarding changing the EV and all the advice was "This is something that a competent diyer can do" , so I just went ahead.

Thanks

Since my original post, I have been told it might be a problem with the pressure reducing valve or the pressure relief valve. I live near Horam, any NSC plumbers cover this area?

Doh, why didn't I think of that?😁

I have a pressurised hot water system, heated by an oil boiler. There's a slow drip from the overflow pipe ( one drip approximately every 20 seconds at the moment but I think it drips more overnight as there's a small puddle on the extension roof in the morning). I was told the problem could be...