The design of the Vickers Warwick started in 1935 to be a successor to the Wellington. The Warwick had a similar geodetic and fabric construction method.
The lack of an engine and waffling officials caused the Warwick to not become a bomber as it was originally designed to be. The initial Rolls-Royce Vulture engines were unreliable. The next prototype had Bristol Centaurus engines, but as these weren't completely developed the Pratt & Whitney Double Wasps was selected in the mean time.
Air Sea Rescue
In early 1943 it was decided to use the Warwick as an air sea rescue plane. 70 bombers were converted on the production line to the ASR.I.
There was a deployable life boat slung under the fuselage. The lifeboat was 23' 6" / 7.17 m x 5' 6" / 1.67 m and weighed 1,700 lbs / 772 kg. There were six 32' / 9.76 m diameter parachutes to slow its decent. There was also survival gear that could be dropped. ASV radar was also installed.