This one took a little research and following a hunch. One method I use is I find similarities that carry over into newer designs from older ones in respect to certain designers/manufacturers. Earlier I thought it might be a version of the short sb3. I realize it looks nothing much like it but I could see design ques. After your musical hint I found that those songs were from '52 so I concentrated on that year. After researching all short productions for 1952 I found it and then looked it up in wiki.
Short Seamew - Wikipedia, the free encyclopedia
only 19 built and it never saw service! Good one GAU!
I will have a question this afternoon when I get home. I have one ready it is just on my other computer. I think another round of name the plane sounds fun. see you buddies!