Infestation of fruit flies

fruit flies are a normal part of life. They appear miraculously wherever a piece of fruit is not tree fresh, but this year we seem to be infested with them - and we are not the only ones. A friend living 5 miles away has exactly the same problem.

It started at the end of August, they were all over the kitchen. When we went on holiday, I cleared all exposed fruit away, put all the vegetables in the garage, wiped all surfaces and just before we left I sprayed the kitchen throughly with fly killer and shut the internal door. We returned home to a fruit fly free kitchen - for about a couple of hours - and they were back.

Yesterday I discovered about a couple of dozen black spots in the utility room sink - dead fruit flies. Now my UR is no where near the kitchen. 2 other rooms and two hallways intervene. Then when I went upstairs to the bathroom i found a dozen in the bath that had been used a few hours previously.

This morning, so far, no fruit flies. Anyone else afflicted with these little blighters this year? It is something I have never experienced before