Wasps nest

If the nest is easily reachable, spray it with insecticide early in the morning - 6-7am - before they wake up and they’ll all drop dead. I took this advice on mine and it works!!

If you can reach the nest the best solution is Ant killer powder. You dust around entrance to the nest, when the wasps go into the nest the powder sticks to their body, they take it into the nest and it kills the whole lot of them. I have used this method every year for the last few years and it works every time.