a very long in the tooth, highly experienced, Fliight Lieutenant from Lancashire, commonly known as "Pork pie Jack"
Could be wrong but that description sounds mightily like the (in)famous Cap'n Jack Huntingdon, ex Master Pilot, sent to Jurby for a 'blood change' together with John Loveridge, also M Plt. These two were A Cat instructors at Dishforth when Auntie Betty decided that all aircraft were to be captained by commissioned officers. Jack was A Cat on Hastings and John held similar on both Hastings and Beverley. I cannot imagine what the Jurby conversion was like!!