length about 4mm
No interactions present.
Possibly a male, or juvenile (April). Not quite up to your normal high standard of photography, jonmortin! Any way, I think you are correct. Was it found indoors?
and yes it's a pretty rubbish photo but the hyperactive subject was partly responsible! It seems this species is very under-recorded as there are (as yet)no records on the BRERC database (former Avon area).
Lat/Lng: 51.4736, -2.6308
OS grid ref: ST562751