OOOOOHH!! A Shagbat!
I sort of knew you had that one, but it's great to see some evidence. I have some detailed photos from RNAS Yeovilton, you're welcome to any you need for details - external or VC.
Goes to lie down in a darkened room, mustn't get too wound up....
Shagbat = RAF slang for Supermarine Walrus: takeoff from choppy water said to be like wrestling with a washing machine.