sentences:  The RAF naming conventions for various types preferred that pure trainers, not conversion type trainers, should have names related to education or places of learning e.g.Airspeed Oxford, Avro Tutor and Athena, the Percival Prentice and Provost and De Havilland Dominie.Balliol is an Oxford University College and it alliterated with 'Boulton Paul'
  
  Pre-production Balliols were delivered to the RAF's Central Flying School in 1950, but with the change in air-training policy, the Balliol was only delivered to one Flying Training School, – No.