Lichen on sandstone boulder. I know nothing about lichens, had a google around: there is a British Lichen Society. Britain, it turns out has a huge range of lichens in part because of our eccentric habit of burying the dead, often with sandstone headstones then leaving the graveyard relatively undisturbed,which is just what lichen like. Any IDs, leave 'em in comments.
The boulder, surrounded by gorse (Ulex sp. I haven't found a British Gorse Society yet). Gorse flowers all year round, and it hurts like the dickens if you fall into it.
Looks like the boulder tumbled from this mid-jurassic hard sandstone layer that caps the cliffs of this stretch of the Yorkshire coast.