Found growing on a deciduous tree. It seems as if the green lichen is erupting into an orange colour.
No interactions present.
Many thanks for your help.
I have amended the category to "other ogranism" and have checked other images of Trentepholia. So I am agreeing with your ID and simply adding a revision to help with future searches.
Lat/Lng: 54.5, -6.4
OS grid ref: NW1620