How can I understand the flies?

fungus-gnatA big thanks to everyone on the Tim and Joe on BBC Leeds Facebook Group for their help on the escalating fungus gnat situation on the kitchen windowsill. Do join the Facebook group (here) for some brilliant information, answers to your gardening questions and tips galore!Fungus gnatsWe’ve a few pots of various herbs that have attracted a load of those pesky gnats of late. Now after posting on the group, there’s a combination of grit on the top of the pots, yellow sticky traps, a sprinkling of cinnamon, a lack of water and finally a trap of cider vinegar with a couple of drops of washing up liquid in it. If this lot don’t work, the pots will be forced outside as we can’t take them damn midges any longer!