The Brawdy 'Strikemouse', operated by JFACTSU, received its camouflage in early 1976.
The JPs were part of Standards Squadron, but were later transferred to 79 Sqn. Before they were withdrawn, they were repainted in that awful 'John Major grey' paint scheme.
Re. the Thorney Island JP, my best guess is that it was used for trade training by painters/finishers. In the same way that an F-4 I saw at El Paso had a stunning 'Korean war' midnight blue finish - but with a Playboy bunny on the tail. I had a photo of that, but someone at
Air Forces Monthly either lost it or stole it....