Ever since we got a compost bin and started keeping a tub in the kitchen for fruit/vegetable leftovers, my kitchen has been overrun with horrid little fruit flies. I've changed the tub to a tupperware one with sealed lid, try and keep worktops scrupulously clean, make sure bin is clean etc, but they're everywhere now, it is revolting. Anyone have any ideas for how to get rid of them pleeeeease?