First dead fly found in the conservatory this year.
No interactions present.
Wing venation and reddish tip to the scutellum are consistent with Muscina (Colyer & Hammond). See also http://www.diptera.info/forum/viewthread.php?thread_id=54101
According to http://eol.org/pages/1032844/details larva of Muscina may be found in the nests of Vespula vulgaris. I found this fly at same time as I found the wasp shown in www.ispot.org.uk/node/322645...
Lat/Lng: 52.061168, 1.159024
OS grid ref: TM166450