Could put it under Photos, Insects:Diptera? ;) Tis a very nice beastie, craneflies seem to be either boring wee grey jobbies or cosmic stunners with bugger all in the middle. I like this one lots! Is there a version of the key online do you know?

There's a nice bit about the species on a Dipterists Forum page here http://www.dipteristsforum.org.uk/t1260-Nephrotoma-crocata-nest-site-pre...

and a map of its British distribution here https://data.nbn.org.uk/Taxa/NBNSYS0000007974/Grid_Map

and there's a wealth of detail regards the genus Nephrotoma early instar larva here, should anyone feel an overwhelming desire to gen up on it! http://nlbif.eti.uva.nl/ccw/documents/Podeniene_et_al.,_2014.pdf