The UK designed and produced a flying boat that was similar in some respects to the Consolidated PB2Y Coronado: The Short Sunderland.
The Sunderland first flew in 1937 and entered service in 1938. A total of 749 were built and they served with RAF Coastal Command, as well as with the RAAF, RCAF and the RNZAF. The latter did not retire their boats until 1967, when they were replaced by P-3 Orions.
The Sunderland was powered by four Bristol Pegasus 9-cylinder radial engines of 1,065 horsepower each. During World War II, as additional equipment such as radar was added to the airplane, performance suffered and the Mark V version replaced the Pegasus with Pratt & Whitney 14-cylinder R-1830s of 1,200 horsepower each. Some earlier variants were upgraded to Mark V standard.
A unique feature of the Sunderland was the provisions for dropping bombs or depth charges. This is generally an issue for flying boats. Short's solution was internal bomb storage with a door and a trolley-type arrangement to winch the weapons out onto the wing, then drop them. (See photos)
https://en.wikipedia.org/wiki/Short_Sunderland