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This fly sat immobile, for quite an extended period, on the sunlit bark of an ash tree. I was intrigued by what looked a bubble that was emerging from its mouth (Images 1 -3). My interpretation of the subsequent image sequence [4-10] is that this is a newly emerged fly in process of activating its tongue/proboscis from within a bubble-like coating* that had protected it hitherto.
(*er… “Bubble wrap”?)
dark antennae on your other example, I notice
http://www.ispot.org.uk/node/317871, whereas here they look reddish
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Yes, the antennae are wrong shape and colour for Heteromyza. I've had similar-looking flies in the garden that are Lispocephala, but I can't say that is what yours is. Alright, I'll say it might be.
There has been discussion of bubble-blowing on Diptera.info
there's one here, apparently blowing bubbles
it looks very good indeed for L. brachialis Grant which is more of a western species. Time of year is right March - June, but they're out now so I'd try looking in the same spot from today. There should be a stream nearby? It's the only orange one so could possibly be done from a photo, but without a specimen I'd not be certain myself. Perhaps a muscid specialist will have a more definite impression. Have you tried it on DF? Anyway a good find
See comment here - http://www.ispotnature.org/node/479974#comment-197447 - if you're interested in why they blow bubbles :-)
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707