H A Brown, how little has been recorded about him! The easy bit; he joined the Company in 1928. At the begining of June 1945, he was signed as medically unfit to fly. After a time as Flight Test Manager, he retired to his deceased Mother's house in Kent. In April 1953 he sadly collapsed and died soon afterwards. From the 3 AVRO history books I accessed, I gained those facts from "Avro, The History of an Aircraft Company" by Harry Holmes. None of them gave a clue to the Captain's age nor his christian names.
Offered for what it's worth.