The Short Empire flying boats started passenger services for Imperial Airways (later B.O.A.C.) in February 1937 and were pensioned off around 1947. Until recently I thought that the Short Sunderland Flying boat was a shorter version of a normal Sunderland Flying boat, then I found out that Short was the manufacturer’s name. Duh!
The ‘Fast Low Wing monoplane’ appears to be the ill-fated Armstrong-Whitworth A.W.29. Only one was built and that crashed on landing during the trials in 1937 and was never repaired because the RAF contract had gone elsewhere.