I'm not sure what species it was, and therefore whether it was technically a "praying mantis" or not. Hopefully, it was a preying mantis and will despatch a few of our less appreciated insect visitors, i.e. cockroaches!
It didn’t come into the house, which is a good thing because the cats seemed super-interested! Indeed, it was Arthur who drew our attention to it, spotting it on one of the outdoor chairs in the dark.
I went out to take a few pictures and it obligingly wandered over to the door to give the kitties a closer look.