The police are patrolling stopping people picking it up, officially its meant to be picked up by contractors appointed by the owner of the ship that sunk. However lots of locals are taking advantage. A smaller quantity came ashore last year in a similar incident. I got a fair bit then but I haven't really used it so I am not sure if I will bother again.
I don't know how good the wood will be for anything structural after a a few days at sea.
Gareth