If its easy enough to reach, and you want to get rid of them,
Buy some ant powder, wait until evening, when the wasps are fairly inactive, puff the ant powder into the nest and around the edge, go in and keep dogs and cats in for an hour or two.
check after an hour or so and you will prob see a few dead or dying wasps on the ground around the nest ( most will just die in the nest )
Brush up any on the ground so that animals or children don't pick them up. X
job done. X