So. Yes, new workshop walls. Looks as there'll be 25mm Jblite EPS 70, thn rockwool 50mm, then Visqueen, then plasterboard. Ceiling, maybe
150mm Isover glassfibre loft insulation, Visqueen, plasterboard.
I was wondering about surface mounting cable, or maybe running it in runking, but what about running it behind the plasterboard? It would look a bit nicer, but would hat be OK?
Lighting to LED probably individual lamps, maybe in batten lampholders.
Power to sockets using 2.5mmT&E.