I quite enjoyed this one after the disappointment of "The Disappearing Man", though not very original, it had an interesting location and at least told a decent story.
A mercenary, Pitt (Edward Brayshaw) having switched sides in an African coup several years previously returns home to the UK with his dubiously gotten gains. Sold out by the warlord he put in power, on his return his former associates led by Mr. Bancroft (Michael Craig) are waiting for him and take him to Stamford Bridge, where they have a plan to take their share from him.
Storyline wise, this was pretty good. Slowly shifting up the tension across the episode before an uneasy twist towards the end that I have to admit I didn't see coming. The performances were all pretty solid too. Generally, I didn't recognise anyone from this although once I looked over their careers on the IMDB I could picture Brayshaw from his run in "Rentaghost".
It was fascinating to see so much of Stamford Bridge in the early 1970's which is, naturally, unrecognisable from the way it appears now. I'm not really sure why they settled on that location within the story, any wide-open space would have sufficed, although I suppose that the idea was that Bancroft provided security to the ground, so incapacitating and paying off the nightwatchman would be easier.
It's nothing ground-breaking admittedly, but sometimes a half decent story told well is all you need.