Flying ants - NOT amateur radio

Black garden ant (Lasius niger). The queens are 

much larger than the worker ants. 

© JvL via Flickr (licensed under CC BY 2.0)

A few years ago our bedroom was inundated with flying ants. Since then we have seen just a few in the house. On a walk around the village today we saw quite a few and there was one in the lounge a few minutes ago. This is the first time I have seen these this year.

See https://www.nhm.ac.uk/discover/when-why-winged-ants-swarm-nuptial-flight.html