This is where I am with the bathroom window reveal:     Cast your minds back:   The generic 2G window is fixed in the outer leaf of a traditional cavity wall.   This is the original window. Tbh it's in very good condition but (only 'cos of this place ) I'm beginning to question it's insulating properties!    The fitting was atrocious. Huge gaps all round, as in near 1" at the top.       Similar underneath. The ga