byw
Thanks LGWCREW. Euravia first, London Gliding Club used to send people on their first aerotow launches form Luton (more spce than Dunstable if things went wrong) so you could well have been watching gliders.
Indeed sadly missed as will be the BY***aB BY***B flight number structure, in use since at least the early 1970s. (there were also some J and Ks then IIRC. I think THOM are using 4 figure flight numbers)