Another daft question, are 25mm ko boxes fitted on the surface of my blockwork correct when I will have 12.5mm plasterboard on dabs around them. I thought so, but see so much about chasing them in. My BI is insisting on them being fitted at first fix electrical inspection before the boards go up, but I assume they are removed before drylining and just the wires poked through in order to make the boards easier to fit - or not? Go easy on me if it sounds too obvious to you!