Indeed that picture was taken on the Sedco 704, over the Claymore/Piper tie in. I was involved in changing A BO105 m.g.b. in that very hangar. I seem to recollect a BEAS Bell 212 breaking a skid on the back edge of the trolley and having to land on sandbags and baulks of timber, I'm guessing that would be '76 or early 77.