de Havilland employees names

Evening all.
A reunion of all personnel involved in the operations of the Vampire T55 in Irish Air Corps service is to take place at Baldonnel in June. Two names of employees have been mentioned in documents, a Mr Richardson and a Mr Thornton, the latter was in the RH seat of a Vampire on its delivery flight July 1956 and the former was I believe involved in the course for the techies. Any information about them would be much appreciated.
Many thanks.
Tony K