For some reason over the last week or so I've had an influx of great big fat flies - the big lethargic ones that don't seem to be bothered about you being near or swatting at them. They seem to be pairing up and I'll find them squatting on my kitchen window, then another couple next to my dining room table. Even in my downstairs loo! My house is clean, I rarely have any food out and surfaces are wiped etc. They are just so disgusting and I'm terrified one of them is going to lay eggs somewhere... What do I do to get rid of them? Is anyone else similarly plagued this year?