About 3 or 4 miles down the west beach. I wasn't aware until looking at Google maps that the anti-tank blocks go all the way to Kingston oO If you ever go down this beach to find these buildings (They are just in the woods next to the pillboxes and anti-tank blocks) be careful, there's still some chicken wire and barbed wire lying around.
Ahha! Thank you! I'd heard rumours it was there and had been dubbed "The Unknown" but I had to see it for myself. It wasn't actually that cold, quite warm inside the buildings. Thanks for the link though