jim8flog
Journeyman Pro
If you cant get at the nest, you can easily trap them - cut top part of a 2 litre soft drink bottle off and invert it back inside the bottle for a funnel effect, hold with a staple or some tape and if you want to hang it off a branch to keep it away from kids or whatever get some string through it. Put some sugar and fruit or jam, anything sweet in it and a few inches water, wasps will go in and cant get out and will drown -it's a bit brutal but you can kill enough pretty quickly to make the nest unviable. Worked for me when we'd a nest under eaves and into attic somewhere.
We always used to that when camping, bottle on a pole a good distance away from the tent.