In reply to Gone for good:
We had a wasps' nest at the front of the house this year. It was like Star Wars, the numbers constantly flying in and out. They found a way into the house through the satellite cable, and every day there were twenty or more pacing up and down the inside of the window, an easy target to capture under a glass and release outside, although many, with their ten days of life, died and fell onto the carpet behind the sofa.
Despite my sealing the point up they still came into the front room, in lesser numbers, perhaps through the cord fitting of the sash window, god knows. In the last week or two they've been crawling all over the frosted glass of the front door, presumably in search of a little warmth. I guess if there are frosts they'll soon all pack up and leave, never to return.