How big is it?
I admire your restraint, I would have been unable to stay in the same room without hunting it down and either scaring it back out of the window or crushing it to death.
When on holiday in France in May one year in the early 80's, I had an encounter with a Giant Woodwasp, their colouring gets them mistaken for a European Hornet, but they are
much bigger. Ordinary ones are pretty big, but I reckon that this one may have been a queen looking for a new home. It was huge! It was about 3" long with a fat body that was at least as thick as my little finger.
Facts added years after the event: At the time I thought it was an enormous hornet and would sting. In fact it was probably a Giant Woodwasp which have no stinger, but look very much like an enormous hornet. If the woodwasp was a queen then it would have had an ovipositor sticking out the rear which looks like a stinger, adding to my initial assumption that it was an enormous hornet
When I first saw it it was about 18" away from my head. It buzzed when I got close and alerted me to its presence. It scared the shit out of me and I accelerated in the direction I was already heading. Unfortunately I was now inside the holiday caravan, with the hornet/woodwasp between me and the door. With some distance between us I calmed down and I remember thinking" no-one will believe how big it is, I need to kill it." So, armed with a badminton racket and a tea towel, I crept towards it. Sadly it saw me coming, and with an angry buzz it flew out of the open door!
When I told people how big it was, I was correct, nobody believed me!