It's the Lennox field gas rig. More can be found
HERE. There is another cam that looks out wider over the sea.
The field looks pretty amazing at night when burning its waste gas or whatever they burn. I was walking back to my mates house a few months ago from the pub at night and we could hear this faint roaring noise in the distance and a strange glow in the sky. Curiosity got the better of us and we got a cab down to the beach to see what was going on and it was the rig burning away. It looked amazing, it lit up the sea for miles around, just awsome really. If you do go up, try and get some pictures at night.