Two harlequin ladybirds seen when looking for lichen
No interactions present.
Yes, looks like you are near the northern edge of the current range, see the map from the Harlequin Ladybird Survey:
I'm sure they'd be pleased to receive details of your observation via the above website.
Entomologist and biological recorder
Lat/Lng: 53.8, -1.6
OS grid ref: SE2734