Clink-clank...another medal

[Jamieone]

For what it's worth Debrett's says this:

How to address Retired Officers of The RAF - Forms of Address by Profession, Royal Air Force
The old-man is an ex-Medical Branch Wg Cdr doctor and his full title (plus array of medical qualifications) would take up a fair chunk of business card. Since he's been a civilian he uses 'Mr' almost exclusively. He never uses 'Dr' and certainly not when travelling; presumably to avoid finding himself cast in some kind of Leslie Nielsen role from 'Airplane' in the event of an in-flight calamity.
As an aside was it B.H. Liddell-Hart who wound up some of the establishment by referring to himself as 'Captain' post-retirement?