We used homemade wasp traps. You cut a bottle in half, put a few inches of coke in the bottle, and then put the top back in upside down. They can't get back out, and die on a sugar high. We placed it away from where we like to eat outside.
Horribly, as they die they send out an sos and and trap their own friends.
Normally I'm.not for harming the wildlife but wasps are just awful
To think that London, or anywhere else for that matter, does not belong to any one demographic
Parents-in-Law. What do/did you call them?