Large Marsh Horse Flies at WWT

I've eventually managed to key out these Tabanid flies as Tabanus autumnalis (The Large Marsh Horse Fly)[female has a 16mm wing as a size reference], there being about 15 of them very confiding on the bridge to the Heron's Wing Hide, so I guess just emerged? Note the eyes touch on male but are separated on female, which is the one with the nasty bite!

male (eyes touching)

female (eyes not touching)