Learn about flies

Hello all,

I'm a new member to the group. I work with Culicoides, so I'm reasonably confident with ID in this particular group. However, I get a lot of other small insects in our trap catches that I'd be interested to identify. Can someone recommend a decent Diptera ID guide, or failing that, would anyone here be able to help if I post a series of images of the main individuals I'm seeing? Here's one from a farm in Devon for starters...

Thanks in advance!

I'd be grateful for confirmation that I'm on the right lines with the ID for what appears to be Keroplatus testaceus. It keys out well but I'm pretty new to most diptera families so wary of bear traps. Photos uploaded which should show the important features for family/species

Location - found indoors early evening suburban environment but near hedgerow/mature quarry/gardens -  Mansfield, Notts 23/9/2022

hello, hoping someone will be able to help me with a fly that I can't place. Probably about 8-10mm (see photo)

Seen just west of Edinburgh feeding on Cow Parsley, thanks

Is this Helina trivittata please? Beds.

I think this is Pegoplata aestiva. Would be nice if someone could confirm/correct that ID please? Beds.

Is this Phaonia tuguriorum please? Beds.

Dark stigma. Crossveins infuscated making zigzag line across wing and wingtip shaded. Rounded tip to the cerci. Nephrotoma quadrifaria? Bromham Hall, Beds.

From Witt's End, Bedfordshire on 4 July 2022, is this Nephrotoma cornicina please?