With the introduction of the Hawker Hurricane into Squadron service in 1937 and the Supermarine Spitfire due soon thereafter, the RAF recognised that they had a need for an advanced training aircraft that would prepare new pilots for the higher performance of the new fighter aircraft. The Air Ministry issued a specification for a new training aircraft and the Gloster Aircraft Company's submission was selected.
The starting point:
As you can see from the drawing I have cut out a template for the cockpit floor and need to work the BUF roundels into the backstory in due course.