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@rhowe
We replaced our lead mains feed and internal piping (mixture of lead, steel and copper) and pressure and flow rate improved substantially.
The lead pipe's internal cross-section was about a 1cm diameter (probably half an inch?). The new plastic mains feed is 38mm I think, which steps down to 22mm copper in the house.
I think we were supposed to go through Thames water to get the feed connected but I suspect our plumber had a mate who knew a mate who could do it. No doubt it'll all be slowly leaking and a giant sinkhole will open up in a few years :/