I worked with Harry, although we knew him as Henry, at TopFlight based at Luton in 1985. TopFlight, Fairoaks based, had bought Air Luton and were operating three aircraft for Royal Mail, based at Luton, Glasgow and Newcastle. We had G-AMPO, G-AMRA and I forget the third, but it wasn’t one of the G-AM derivatives. If anyone is still following this link (I’ve just found it out of curiosity) I’ll be happy to post more