About 10mm long. Very active.
No interactions present.
If there are roses around, then Rose Sawfly might be the answer.
If you Google Rose Sawfly, you'll see quite a few pictures. There is some variation, which might be due to Biology, or to erroneous identifications!
No roses for miles that I know of!
Lat/Lng: 58.4735, -6.2222
OS grid ref: NB539616