Aaah, more nostalgia.
They were often used by I.Fitt.NI Apprenti to do autopilot checks and we E.Fitt.A Apprenti were forever changing inverters for them. T'were amazing some of the places where Glosters managed to hide the electrical bits, I'm sure glad I went to Vulcans where you could at least see the bits you were working on instead of doing it all by feel.
