Can't find how to add pressure to boiler after bleeding radiators I think it's the black valve at the back but not shore
There is a switch that says boiler off filling loop but nowhere to connect other end of loop think it's been close off any advice apreciated.
I'm thinking just age 1930s ,the plaster seems fine elsewhere that's why thinking just cut back square to stable plaster and either screw board to joist or fill.
what mortar mix to use for areas of pointing coming off stonework, also what is the dark grey compound used to lay the bricks feels crumbly if rubbed? 1930s terrace.