I once left my Dad and ex-husband to fit a second hand leaded light window in the kitchen to replace the old one. When Mum and I came home we were rather surprised to see that left hand and middle panes still had leaded lights but the right hand pane was now plain glass. "Oh," they said, "The window frame was too big for the whole so rather than remove a brick, we cut it down." "Oh," says Mum and I in unison, "Why didn't you cut the static middle pane so it at least looked symmetrical and we could still open the right hand window." "You're always complaining," they said! We still giggle about it 40 years on.