What did you do in the Great Plague, Grandad?

Well, there was this.........

and my "Right said Fred" moment; honest, guv, I measured the gap on the top staircase carefully before I built the baseboard.  I ended up having to cut off two opposing corners.......

Still, the end result is up there now.  All I need is my grandchildren back.  The boy, Jasper will not be too bothered but the little girl Ava will adore it!