Very narrow about 30-35mm long reddish brown ,cat like head.Found on clothes after moving through scrub.
No interactions present.
I think the time of year makes Feathered Thorn very unlikely, so I'd go along with your suggestions "or related species"! Without a foodplant to narrow it down I can't make a guess at this one.
Entomologist and biological recorder
Lat/Lng: 52.5, -7.8
OS grid ref: SF0815