The Witness was one of two SS:TF directorial credits for David Maloney. Knowing his fondness for using a regular “rep” of actors, I had a quick skim through the cast list to see if I could spot any familiar names.

There’s Tony McEwan, for one. Maloney had already used him in one Doctor Who (The War Games) and would later cast him in another (Planet of Evil) in addition to Hawkeye, The Pathfinder. Given McEwan’s fairly limited list of credits, these performances constitute a fairly sizeable chunk of his television career.

Today he’s playing Carson, a lorry driver whose cargo (scotch whisky worth twenty grand) is hijacked by a gang of gun-toting masked men.  It’s not the best performance you’ll ever see (although there’s a even less convincing one later) but Carson’s interrogation is still highly entertaining, mainly because both Barlow and Watt are in the room.

The pair work well apart, but something special tends to happen whenever they team up. They’d begun the episode in Barlow’s office, enjoying a late-night drink. Barlow, still smarting that his promotion prospects have been dashed, was clearly in need of a shoulder to cry on and Watt fitted the bill nicely.  As for Watt, having done his duty he was looking forward to getting off home, but a last minute phone-call (about the robbery) dashed that.

For Barlow (fretting about his empty house) more work is just the ticket. Watt seems less enthused about rushing straight over to take charge, although the private smile he gave before they both left the office was a nice little moment, letting the audience know that he didn’t mind that much (presumably he’s just relieved that Barlow has something new to occupy him).

The always-reliable Ron Pember turns in another good performance as Wilf Taylor. He’s a member of the gang, albeit a somewhat sickly and insubstantial one.  The power behind the throne seems to be his wife, Betty (Mitzi Rogers).  SS:TF wasn’t renowned for having that many strong female guest roles (crime back in the seventies seemed very much to be a man’s world) so Betty is a notable character, even if she does end up as a victim by the end of the episode.

She runs a corner shop (which bears a passing resemblance to Awkright’s store) and right from the off is very combative.  Dominating the weak Wilf, she then steps up the intensity another couple of notches when the police come calling.

Most of her early ire is directed at DS Green (Heather Stoney). If the series didn’t specialise in decent female guest roles, then it also was struggling at this point with its female regulars.  Stoney, with her handful of appearances across the third and fourth series, always played what she was given very well, but Green was rarely placed in the centre of a story.

Mitzi Rogers has the best guest role of the episode (Betty’s heavy blue eye shadow and leopard skin coat helps to make her stand out) but James Mellor, as Albert Dirman, is also very watchable. Dirman is the Mr Big of the hijackers and reacts with cold fury when he mistakenly believes that Wilf’s talked to the police (he hasn’t, but Betty has).

Dirman’s promise to disfigure Betty with acid is a chilling one, although the threat is slightly negated when the instrument of his retribution – Stan (Gordon Bilboe) – lumbers into view.  Partly it’s because of the haircut, moustache and suit, but there’s no denying that Bilboe’s performance is rather stilted. True, he’s not gifted terribly good dialogue (mostly it’s of the “you got nothing on me, copper” variety) but Bilboe’s delivery doesn’t help ….

The late action scene (Hawkins purses a fleeing Stan) isn’t that convincing, but the main thrust of the episode – the way that Barlow manipulates both Wilf and Betty in order to nail Dirman – is very compelling.  And the final sting in the tail (even after Betty’s been attacked with an iron bar, Wilf is unwilling to talk) is a fascinating wrinkle.  Another strong series four entry.