Bottle TIts

This is the nest of the Long-tailed Tit (Aegithalos caudatus to you), a bird known to me when I was growing up as Bottle Tit. The nest says it all.
I have heard recently of Long-tailed Tits nesting in a regular tit box. It must be a first. Has anyone else come across this aberration?
By the way, I am still waiting for someone to come up with a good collective noun for Long-tailed Tits. It will have to be good to beat "an oddie of bearded tits".