Small fly (~4-5mm) on a dock leaf.
No interactions present.
I think as this is a female, the metatarsus need not be very swollen. I found lots of B. chalybata and M. cyaneiventris on tree trunks yesterday. See http://www.diptera.info/images/photoalbum/album_48/berismating.jpg.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Your quite right Ophrys definitely one of the above genera. I've delved into Stubbs and Drake, Britis Soldierflies etc and wonder.
Eyes hairy, and spines number four, large and bald = Chorisops.
Eyes lacking hairs and spines 4 - 6 with hairs = beris = Beris.
It certainly looks like it has hairs on the scutelar spines, I can't vouch for the eyes on the photo.
If it was Beris I get either morrisii/chalybata. Chorisops it might be tibialis
Lat/Lng: 51.5, -1.8
OS grid ref: SU1987