You can thank Capt Alan Harkness for bringing VM down to 1mb, it was after all, by Royal Appointment.
He went on to fly Concorde after that.
As I recall, Alan Harkness was also the personal pilot of David Somerset (now the Duke of Beaufort). Occasionally we instructors at the Airways Flying Club were involved in ferrying the Duke's PA28 (G-AXOR) between Booker and Badminton (the Duke's residence) and vv.