I know this genus can be tricky from photos but I think this is a female S. ribesii as the hind femur is yellow.
No interactions present.
It is as you say 'likely to be' S. ribesii, but you cannot exclude rectus (a species about which not a lot is known, it seems). Indeed, the darkening that appears about half-way along the hind femur might suggest exactly that one. Then again it might be a shadow.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 51.7, -2.6
OS grid ref: SO6302