Saunders-Roe A.36 Lerwick
The Saunders-Roe A.36 Lerwick was a British flying boat built by Saunders-Roe Limited (Saro). It was intended to be used with the Short Sunderland in Royal Air Force Coastal Command but it was a flawed design and only a small number were built.
Source: Wikipedia — Saunders-Roe A.36 Lerwick (CC BY-SA 4.0)