Golden Horn-G-AFCK
Not a Sunderland but an Imperial Airways G-Class which is said to have been converted to RAF use under X8273.
So this aircraft was on the strength of the RAF and its crash report will be filed at RAF Hendon Museum.
And the Best Of British Luck! I wrote a crash report and 50 years after the pilots had apperently changed seats at 100feet on a dying engine- over RAF Hendon.