49 AT 19 is shown as being issued to QOY , Queens Own Yeomanry, my dad's old TA regiment on 13/07/1995, until 27/04/1999, there were 3 squadrons, Y Squadron based in York (my dad's lot), C Squadron based in Cheshire (the late Duke of Westminster's unit), and A Squadron based in Ayr. So as your vehicle served in both the RAF and the Army, Bovington will hold the record card.