Seems I have been misled by technology.
The Flight Tracker [FlightRadar24] shows text that the P68 last flew from DSA to North Weald on 6/10 but the track map on the same app relating to the same flight also shows that flight to have been from Doncaster to Hurn where Gama have their main maintenance base.
The result is the same, one NPAS permanently out of DSA, but the detail about North Weald is now suspect.