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They didn't tell me anything about the supply pipe, but the stopcock in my property looked like it hadn't been opened in decades The hole was filled with soil and rubbish. Took me a good 30 mins to get down to the tap. It's about 2 feet down and in quite a tight enclosure, so will be tricky to...

I've looked everywhere but can't find it. It may have been removed by previous tenants or concealed behind the fitted kitchen. However, I got Thames Water to come out today. They measured 8L/min flow on my kitchen tap and 25L/min at their main stopcock. (They also measured 15L/min on my garden...

Thanks. I'll start by checking with the neighbours. I have never identified an internal stop tap but again I'll check with the neighbours (we live in a row of identical Victorian terraced houses).

Thanks. I have actually called Thames Water already and asked them to come and check my flow rate. The main stopcock is definitely fully open. Would you happen to know what the water company's obligation is regarding flow rate? By my rough test today, I'm getting 9.375L/min through the kitchen...

By the way, the shower/bath mixer is pretty similar to this (and made by the same manufacturer): https://www.amazon.co.uk/Mercati-Charleston-Shower-Mixer-Complete/dp/B00EJP5MY6 If I knew that replacing this would sort out my shower problem, I would do it straightaway. But the mystery remains...

I have only 2 mixer taps: the one in the downstairs kitchen and the one on the upstairs bath/shower. Unfortunately, I cannot perform this test on the bath/shower mixer without causing damage to paintwork and grouting. Of course, I'd be willing to do this if I've eliminated all the easier to...

OK, thanks. So I think I can disregard both flow sensor and diverter valve.

Thanks, but I had the heat exchanger replaced last year, as I thought it might be scaled up. The old heat exchanger was in perfect condition but it was replaced nevertheless. So I think it's unlikely to be the heat exchanger. I had the diverter valve replaced at the same time. But am I right in...

I just ran 10L of cold water through the kitchen tap in 64 secs. I guess that's 9.375L/min. Does that sound normal? (BTW I did the same for the shower upstairs - cold tap but without the shower head attached. That was 10L in 1min48secs = 5.55L/min.)

The plumber measured 2.5 bar on the inlet to the kitchen tap. Is that normal?

The problem is most pronounced with the shower presumably because of gravity. I haven't specifically tested separate separate basins (will try that tomorrow) but it is true that if I open hot tap on any basin and then open cold on the same basin the boiler will stop sufficiently heating the...

Thanks, although I don't quite understand how this works. If cold is passing into the hot water at the mixer tap, wouldn't the water come out at exactly the same temperature? Also the problem occurs with other taps in the house. It's just much more pronounced with the shower mixer, presumably...

Thanks - no-one has mentioned this before. Couple of questions: How can I check if this has failed? Or do I simply get the valve changed and hope that's the problem? Is the non-return valve definitely on the water heating? Some other sites suggest it is only on the central heating.

I have a shower running off bath mixer taps (i.e. not an electric shower) and for the last few weeks it has been driving me insane... hot water has been intermittent and water pressure is terrible. Plumbers can't figure out what is causing the problem. What happens is this: when I turn on the...