Dear Christine, we have water meadows near us so get a lot of unwanted insects. However nature has provided the answer with the swallows, sand martins and House martins, which are all swallow family.
To help matters further we have a lot of Common pipistrelle bats, As we have no rabies at all in the UK and all bats are highly protected by law, large colonies exist. It is a most wonderful sight to see them vacuuming the insects up from the meadows, and indeed anywhere els they can find them!
We have a large colony of Common pipistrelle just near us living in the roof of a neighbours house. Although messy, they cause no trouble really as they are small, but fantastic insect catchers.
Regrads from a most humid England.
Neil.
p.s. A Hibiscus in flower in the garden!