Was it definitely wasps not Hoverflies?
Hmmm. I know I would have run away too.
You can ring the council or a pest control company to remove them but I don't know how expensive that will be. Why not get keith to come and remove it for you. Wrap a net curtain round his head and body (well maybe 2 net curtains ha ha
) I wonder if they don't like citronella candles like other insects. If they don't maybe you can burn a few near the nest until they all leave.