As further testing of the prototype continued, the reliability of the engines and gearboxes continued to be problematic, but not to the extent that flight testing was prevented. Evaluation of the flying boat continued into 1953, during which particular attention was devoted towards addressing the difficulties uncovered. During the 1953 Farnborough Airshow, the prototype was displayed. Flight tests of the prototype continued up until 27 May 1954, by which point it had been found that the Proteus engine, once perfected, would be capable of enabling the type to achieve its envisioned performance figures. "G-ALUN" was the only model to fly, performing 46 test flights in total during which 100 hours flight hours were accumulated.