Looked on the window and saw the monster below!
Apologies to anyone of a sensitive nature, but it had to go.... No easy feat mind, as I got a bit of cardboard and pressed so hard on the glass that it was in danger of dropping out - and still the little (sorry, big) beggar wasn't squished. Even after a few goes with a piece of wood it didn't crush.
Thinking it might have been a Queen Wasp, as we had a wasp nest in the garage last year?
(NB 10p piece to show scale!)