Helldriver,
The Test Pilot series was made in 1985 so many are now starting to retire. As far as I know and from rumour control:
Robin Tydeman, retired (from AAIB inpector)
Les Evans, retired from BA but running his own systems testing company
Jim Ludford, I think still flying commercial out of Glasgow
Nick Coulson, working for Australian CAA
Steve Moore, RNZAF Group Captain and was in the London Embassy a couple of years ago
Mirco Zuliana, now a general
Serge Aubert, last heard of as base commander in Djbouti
Harry Fehl, boss of German Air Force flight test centre at Manching
Dave Southwood, tutor at ETPS
Al Howden, transferred to RAF, last seen flying Chinook
Bob Horton, Jet Fleet manager for Flybe
JT Koh, retired from being boss of Singapore Air Force flight test centre
Others (Tom Koelzer, 'Mike' Micklejohn) not sure.