In the Orkney Book of Wildflowers, Primroses appear in the Wild Wood section and Lesser Celandine in the Tame Wood. We know that species do not stick religiously to these habitats and both Primrose and Lesser Celandine can be seen in other habitats. Go to Dingieshowie and you'll see plenty of Primroses in among the mature dunes; go to the Ring of Brodgar and you'll see a great carpet of Lesser Celandines in the great ditch.
Primroses at Dingieshowie
The carpet of Lesser Celandines at the Ring of Brodgar