Bertie, I know a lot about wasps generally, partly as I am into insects, partly because of my allergy, so maybe the following will be helpful?
Queens emerge in Spring, after hibernating, they are the huge wasps you might see around in late April or May, they are highly unlikely to sting unless you actually crush one, they are too busy feeding and finding a nest site. Once they have made a small nest and laid a few eggs, they feed the grubs that emerge on insects, so they are out foraging for insects in the flower beds, and aren't interested in people or sweet food.
The grubs hatch as adult wasps who then take over all care for grubs while the Queen stays in the nest. All adult wasps can only eat nectar, the grubs only eat meat, so while the nest is still producing grubs the wasps will go for meaty things on a barbecue. They will sting to defend a nest or if threatened, and they do get annoyed if you block the flight path from the nest, so if you know where a nest is, keep to the side of it.
Later in the Summer the nest breaks down as it produces next years queens, they mate with the males, and then no more grubs are hatched. The queens find a spot to hibernate, the males hang about drinking nectar from flowers, or anything sugary, and they love alcohol eg rotting fruit which makes them a bit dopey and sting happy. As the nectar sources dry up and the weather gets colder, the males die of cold and hunger. Then it all starts again the following year.
At the allergy clinic they tell you not to wear flowery prints, perfume, or sandals anywhere where there might be wasps about, and not to walk about barefoot. Also no bright colours. All that minimises the chances of you being stung. And hairspray acts as a good repellent, it sticks their wings, so they avoid it and will fly away if you spray it about. (or get stuck and fall to the ground). Hope all that helps a bit. Even though I am terrified of getting stung because of my allergy, wasps are interesting creatures. They are great pollinators and they eat a lot of other pest insects like horse flies.
Good wishes, hellymelly