For what it's worth, we had a wasp nest in our loft one year. I did try and get someone to remove it, because I'm allergic to wasp stings and I was scared, but they couldn't find a way to get access, so we left it.
You could see the wasps constantly pouring in and out of the eaves, it was cool to watch, and they didn't come into the house proper until it started getting properly cold. By then they were slow and sleepy, and nobody got stung.
For what it's worth, we had a wasp nest in our loft one year. I did try and get someone to remove it, because I'm allergic to wasp stings and I was scared, but they couldn't find a way to get access, so we left it.
You could see the wasps constantly pouring in and out of the eaves, it was cool to watch, and they didn't come into the house proper until it started getting properly cold. By then they were slow and sleepy, and nobody got stung.