For the curious I had BG out to survey for a heat pump install this morning. (If they'll do a - supervised - install for £3k that's eminently reasonable)     - The pre-install data gathering is name / address / photo of electricity meter and consumer unit for a load calculation (for looped supplies or over 60A on single phase and they'll refer to DNO before going anywhere - though in my case they've not spotted the looped supply and proceeded regardless)   - They're inst