B.G. Cramp's book on British Midland mentions the 748 demonstrator paying a visit. Also, that the common "STAR" from the west was to leave the LIC NDB, hope for a cloud break, and follow the A38.
I read that it was quite wet, and positioning Argonauts left large ruts.
My dad started there in late'-64, and impressed the management by reviving most of their dead motor vehicles, thereby assuring him a job at the MT at CDD in '65.