I know you'll be already back but just a heads up if your there again theres plenty of old Forts around Pembroke Docks. Scoveston and Hubberstone Fort are pretty good, There Derelict and Abandoned but have tunnels, magazines and olther buildings etc...
Scoveston Fort (
http://www.standingquiet.fotopic.net/c1686883.html ) is owned by a farmer now and the most common heard story is of a man being seen in the fort that hung himself nearby afew years ago.
Hubberstone Fort (
http://www.standingquiet.fotopic.net/c1686846.html ) im not sure who owns it i think possibly port authority. Its a nice place You have the main Fort on top of a hill then its runs down the hill to the seas where the Artilliary would have been.
I am returning this weekend to attempt afew more Forts in pembrokeshire including St. Catherines Fort in Tenby,
Matt