Having read an article on the vital importance of labeling wiring, I have added that to my “to do” list.
This is the panel:
The modular switch panel, closeup:

Switch Panel. I took out the fridge and diverted the power to the workstation for satnav, comms, fm/sw radio etc.
Snakes’ wedding: the wires. White ones tend to be legacy wiring and domestic lights, some live and some redundant but left in situ. Some labeling done, lots to do!