No interactions present.
Sandwich Tern maybe - juvenile?
I don't think this is a juv Sandwich tern - the bill appears to have a reddish colour and appears too fine in structure for a Sandwich tern. If it were a juv Sandwich tern it would have a a scalloped darker mantle.
This is a tricky photograph to work from - not all birds are identifiable from from photographs.
The lack of contrast in the primaries suggests it is probably not a Common Tern; leaving Arctic or Roseate from amongst the more common British terns; but there are others.....
Common tern juv always appears dirty looking compared to arctic tern juv.
Lat/Lng: 51.3205, -2.6173
OS grid ref: ST570581