TH
Hate to be the one to spoil your thread but, if you are planning ahead for his dining out/retirement bash, why not just elaborate what you have already said here - that he has enjoyed an exceptionally long flying career on fast jets and is a very generous host who enjoys entertaining and occasionally serenading his guests.
Why spoil it by soliciting for "dirt", he deserves better than that, especially now that he is retiring from the RAF.