One of the first jet trainers, the S.14 was a big machine compared to e.g. the Fouga Magister. This is the prototype, which was re-engined with a Rolls-Royce Nene, putting the Machtrainer firmly in the advanced trainer class. The 20 production aircraft had the original Derwent engine.
This photo was added on 25 July 2017, and has since been viewed 69 times.