HH6702 - it has just occurred to me that the info you want may be found at Scotavnet in yahoo groups. They gave me the reg of a Ryanair I flew on 3 months after the event although as I said previously I could not claim it as I had not seen it but I was curious to know if it was one I had already been on. The main man tho' for aircraft movements and regs at Edi is Jim Fulton At Scottish air news. I asked him about a Swiss Lear Jet in August 1968 HB-VBA for my book on Edinburgh Airport and he told me it came in twice on 8th August 1968. If he can't give you the answer I doubt anyone can.
Good Luck.