It was G-AGID ('IO was a C-47A Dakota 3). From my excellent Aviation Hobby Shop publication, it was a "Catalina 4A, first registered 5 July 1943, returned to the RAF on 28 Nov 45 as JX575, and scuttled off Freemantle (sic) Australia on 15 December 1946." G-AGIE (JX577) suffered an identical fate.