The Fourth Arm (1982)
Another Gerard Glaister produced series. Produced in 1982 comprising of 12 episodes "The Fourth Arm" is about a raid on a German facility in WW2 Starring Paul Shelley who played Major Nick Bradley in Secret Army.
This series plays out almost like a Major Bradley spinoff series where Shelley plays Major Hugh Gallagher who is pretty much a clone of Bradley.
A brilliant series, same kind of pace as Secret Army and the same feel. I'm currently watching it on YouTube and I would thoroughly recommend it to all Secret Army fans.