For the past few nights my kitchen has been invaded with a mystery flying bug. They sit on the walls and don't move, and look really odd. I ended up taking a picture and submitting it to the Natural History Museum website where there is a forum for bug identification. 5 minutes later an expert on bugs told me they were mayflies, usually found around ponds. That is the best service ever, and who knew there was a bug forum?! I might go out in the garden and find other bugs to submit. But I don't know where they are coming from, we don't have a pond. Now I'm worried we have a subterranean pond under the house and the kitchen is going to fall into it. I shouldn't watch that "Help my house is falling down", it doesn't half make you paranoid!