No interactions present.
Appears to have finely serrated antennae so I'm happy to agree it as this species rather than Light Orange Underwing.
Thanks. I hadn't realised the two species were so similar and thought this one could be identified from the pattern on the forewing.
I have uploaded a 2nd photo which shows a more detailed view of the antenna on the right which might help to confirm/change your opinion.
P.S. My limited research suggests that the Light Orange Underwing doesn't usually occur in S. Wales if this helps.
So I'll stick with OU.
I'd be a little cautious with published ranges for this genus as it is quite under-recorded. The early flight season, and tendency in the main to stay at the top of trees, means it can go overlooked.
I always take distribution maps with a pinch of salt and will particularly bear your comments in mind for these.
Lat/Lng: 51.54289, -3.6245
OS grid ref: SS874839