Found them

Feeling totally whacked but can’t do nothing so started on the detail design of the new hot water/central heating installation.
This involves a thermal store and a gizmo that diverts any electricity from the solar panels that is being exported to the immersion heater in the tank. That means you don’t use gas to heat water in the summer and you get heat during the day in winter which is stored and used at night.
It all needs a major upheaval and I’ve been peering down gaps in floorboards to find the central heating headers upstairs and there they are!
Good new is that the floor above is in the airing cupboard so I can put tees in and connect the thermal store to the radiator circuit relatively simply. Well when I can hang upside down without my head exploding that is.....