A quick search on the old google turned up this:
"Helicopters Replace Boats at Rigs
The plan, called Project Jigsaw, would station four helicopters on separate platforms in the northern, central and southern sectors of the North Sea. Two more helicopters would be land based—one in Aberdeen and the other in East Anglia."
http://www.aviationtoday.com/cgi/rw/...rotorcraft.htm
dunno if this is what crud12001 was refering to, but i tried
Wooly