A combi, but that is fed from SC 2, there isnt a problem on that side, its from SC 3 to the bathroom, just on the CWM which feeds just the bath, HB and WC
Just to reinterate (there are a lot of pages to go through, and rather than read the lot, here it is in a nutshell)
SC 1 feeds everywhere, SC 2 feeds the granny flat, boiler, sink in the granny flat, shower, WC in the granny flat AND the new kitchen
SC 3 feeds JUST the bathroom on the main house and just CW and this is where the problem is, the meter only runs when SC 1 and SC are open but taps are shut (WC isolated)
Okay ?
Clear as mud 🙂🙂