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OK, tested flow rate today kitchen tap turned on and set to leave 1.0 bar residual pressure this gave me 28.4 L/min (10litre bucket in 21.1 secs) will this be enough for a combi?

That's great news. Can the upstream stack be internal rather than penetrating the the roof. I have seen mention of an 'air admittance valve', but not sure if i am getting the right end of the stick?

I've checked incoming pressure (3.0bar), but how do I check flow rate, and what does it need to be? Is it as simple as a bucket and a stopwatch?

Looking to do away with the hot water storage tank in our house by getting our 1970's boiler swapped for a new combi. This will free up space for a potential en-suite (see my other post). From what I have read, a standard combi may not provide enough HW for en-suite and main bathroom, so I...

Is it possible to connect 2 WC's to a single horizontal soil pipe I am considering turning a walk in wardrobe between our main bedroom and bathroom into an en-suite. The wc in the main bathroom is against the North wall, and drains to the soil stack on the East of the house. If we go with the...