photographed before the sun had warmed and dried it and before it became active.
No interactions present.
This is actually an immature male, rather than a female - although it does look like a female because of the dull colours.
If you look closely at the tip of the abdoen you will see three appendages (females only have two), and the base of the hind wings would be more rounded on a female.
Thanks for your help!
Lat/Lng: 51.7826, 0.911
OS grid ref: TM008133