Quoting Mike Geldart <mike.milton-chat at geldart.com>: > I think we identified them as Filter Flies from the sewage works see > > www.pestcontrolportal.com/pests/pestScript1.asp?id! > > > Rgds Mike The ones I get in my house don't look like the ones in the picture, www.pestcontrolportal.com/pests/pestScript1.asp?id! they are much more delicate with longer bodies and legs, and look like mosquitos, but probably a bit larger than mosquitos, and don't seem to make the same helecopter sounds. Martyn