That Comet 4 is G-APDT, on its retirement from BOAC service it was sold to Mexicana who later sold it back to BOAC for use as an apprentice training airframe. The inside was stripped and refitted as a classroom under the supervision of a dear old gent Mr Arthur Evans. We ran the engines and generally played around with its systems, including fiddling with the radio which was curtailed after some rather none standard RT was broadcast!