I’m looking for some advice on how to fit new skirting. We have a new engineered wooden floor being fitted in a week. I have started removing existing skirting board as carefully as possible. The new floor needs expansion gaps near the walls, so new skirting boards will hide that gap. The old skirting was attached to wooden uprights with very old clasp nails. Some of the wooden uprights are loose now, a couple came out completely. I think they would be hard to use effectively to screw into now. There was a gap between the brick wall and the skirting, ranging from 15mm to 25mm in some parts. The brick wall is quite crumbly in places too. See attached photos. What do you think is the best way to attach new skirting? Our handyman suggested glueing plywood strips (using gripfill) to the brick wall…. Then the skirting could be attached soundly with glue/screws to the plywood. Does this sound like a reasonable idea? Any other suggestions?