Where was Black Mirror’s 'Crocodile' episode filmed?

This image appears in the gallery:
11 Surprising "Black Mirror" Facts You (Probably) Never Knew

1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 

10. 11 images

See the full gallery: 11 Surprising "Black Mirror" Facts You (Probably) Never Knew