For about a week now we have had better summer weather in this part of the UK. Temperatures have been in the mid 20s to low 30s (deg C) all week. We had one big storm which dropped humidity, but yesterday and today are hot.
It is also "flying ant season". Whilst I was out yesterday we had hundreds of flying ants in our bedroom. I gather these larger,flying ants are queens.
See https://en.wikipedia.org/wiki/Nuptial_flight .