You're welcome ... I have just remembered I know someone who was involved with the Orkney ferry ... I'll write to him and see what I can find out ... He may know someone who can help you, at least ... only thing is that he is very busy ( often out of the country ) and it may take a while. There is someone else who may be able to help .... Watch this space.
Information received from Mike Clouston, born and brought up in Orkney.
"I have a book "Days of Orkney Steam", written by Alastair & Anne
Cormack, and published in 1971.
In there the only mention of the "Elwick Bay" is as follows:-
Acquired by Dennisons 1959
Builders Koster HZN Gideon
Engineers Deutz A.G.
Where Built Gronningen
264 Gross tons
Notes Ex Torwood etc., re-engined Lister 416 b.h.p. Last locally owned
"I have another book "Tales of the Elwick Bay" written by Bill and Sylvia
Dennison and published by them in 1989, in which they tell some humorous
stories of their time while they were coasting with the ship."