very small bug, maybe a fly or a wasp of somekind?
No interactions present.
It is one of the Tephritids or picture-winged flies, that develops in mines in the leaves of Hogweed and (in my garden) Lovage.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 51.2185, -1.4837
OS grid ref: SU361467