Had similar just after a previous thread on here a few weeks back.
If they are going in / out from the outside get the powder. I got some Rentokil stuff from Amazon.
The entrance was in the eaves and I could reach the entrance from the bedroom window. So one night around 1030PM donned riot gear (well jacket / gloves / hat goggles and gave the entrance to the nest a good dousing. Did I say I, I meant Mrs F 😛
Activity decreased. I had to treat it again 3 or 4 more times before the activity stopped.
I felt bad. I didn’t like seeing dead and dying wasps on the pavement below. But it was right above the front gate and my bedroom window. I didn’t want the bang of the gate angering them and attacking the delivery people. I definitely didn’t want them in my bedroom.
Reminds me I need to go up in the loft and have a look at the next I reckon it was a big one.