Thanks for the information. The "Peterland" in question is the smaller of the two, the 1938 version. I had a tour of the vessel when she was last at Wisbech. The Captain said all the
Captains in their fleet were required to have a spell on her as she was the smallest.
I have a black and white photo of her passing the Guy's Head lighthouse on her way to the Wash on a very foggy November afternoon in the late 1950's.
Best regards.