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Am I right on this? I struggled a bit even to settle on the family. If it is Hydrellia, I have learnt from previous threads not to expect a species determination ;) These flies have been in my mother's garden in Yorkshire at least for the past few weeks. There is no standing water. They always seem to be within about 300mm of the ground, which is well covered by plants. They seem to favour Alchemilla mollis. See below for some feeding behaviour.