Yellow and black fly with elongated wings and long legs similar to a crane fly. I think a hangingfly but I'm not sure.
No interactions present.
suggesting an identification, do check that the taxon occurs in Britain, Bittacidae does not. NBN http://www.searchnbn.net/ is a good place to start. Note also number of wings!
Lat/Lng: 51.6121, -1.1182
OS grid ref: SU611907