Following his tour as an Instructor, Richardson undertook the Empire Test Pilots' School Fixed Wing course in 1968 where he won the Hawker Hunter trophy with B.P.L.
At the completion of the course he was posted to the Aircraft Research and Development Unit, RAAF Base Laverton.
He was actively involved in the operational development of the RAAF's Mirages, F/A-18 Hornets and F111Cs, flying 5500 hours in over 40 types from sailplanes to the F-16 and F/A-18.
[2] In his later career he specialised in strategic Defence planning (he was co-author of the 1994 Government White Paper on Defence) and in RAAF personnel management, finally spending several years as an air vice-marshal looking after RAAF personnel and budgetary resources and later Deputy Chief of Air Force.
After part-time Reserve duty conducting a major review of the Defence Cadets organisation, Richardson retired from the RAAF in 2003.