To the first poster.
I would get the one in the roof tiles professionally seen to - by the council probably - if the wasps are bothering you at that height. Otherwise you could just leave it. It is true, they will abandon the nest in mid October and won't return next year although they may set up a new nest nearby.
The one in the hole in the brick wall. Is that at a fairly low height? That you could reach without ladders. If so, you could deal with it yourself. Buy a can of the wasp killer foam stuff, not the spray, that's pretty useless. Then put on protective clothing - just make sure as much of you is covered as possible, gardening gloves, wellies ... hat/hood. Go out at dusk, the nest is quieter and the wasps are going to bed. Never do this in the middle of the day. Spray the entrance to the nest and then stand back. They will come rushing out and there will be a lot of activity. In a few minutes when it quietens down spray again, and repeat this for as long as you can bear. Then do it again the following day, and so on, until you see no activity in the nest. I've done this a number of times, we always get a nest somewhere in the garden every year. So far I haven't been stung and am terrified of being stung because my father was allergic and I have asthma.
All the best.