This a WWII era color photo of a Royal AIr Force PB2B-2 Catalina of the SEAC. A rather rare photo as the RAF only received an estimated dozen or so of these Boeing built aircraft.
John pointed out that there are several PB2B-2 in the PBY-6A section. I'll make a point of identifying them - soon, I hope.
(Photo courtesy of John Voss)