Watch this

The Untold Great Fire of London 8pm, Channel 4 The latest in the series examining the role of the "foreigner" in key moments of British history looks at the Great Fire. In the hot summer of 1666, 13,000 homes, 89 churches, and 80% of building stock were destroyed – it was a disaster of cataclysmic proportions. A clumsy baker in Pudding Lane is thought to be the cause, but at the time it was considered part of a plot and Londoners sought their revenge on foreigners. Some fancy reconstructions tell the story. MS Reunited 9pm, BBC1 The agonies of the middle-class couple – it's a social predicament that writer Mike Bullen has made his own. As the creator of Cold Feet and Life Begins, Bullen's speciality is a very British kind of amiability in the face of potentially devastating relationship issues, and that – although no tapes were available – is what appears to be the story with Reunited. Remember This Life +10? Well, that's a close cousin of the premise we have here: after eight years apart, a reunion is convened in London between former housemates. You can move house but can you ever really move on? JR Men About the House 9pm, BBC4 Bumbling. Accident-prone. Racist. Dead. As this documentary shows, dads have usually drawn the short straw in Britcoms from the 1950s on – unlike their sensible wives or drily witty teenage spore. If they're not being the butt of jokes, they're just odious: Geoffrey Palmer in Butterflies, Old Man Steptoe, or Alf Garnett (pleasing symmetry that Warren Mitchell's on-screen son-in-law Tony Booth latterly became a real-life father-in-law-from-Hell for Tony Blair). Features clips from the likes of Only Fools … , The Royle Family and Gavin & Stacey. AJC Justified 10pm, Five USA So far this show has made a great job of building up the villain, Boyd Crowder, brilliantly played by Walton Goggins from The Shield, making his prison release (next week, gulp!) something to be feared. In the meantime there are a few loose ends to take care of, with Raylan's ex-wife's new husband and his dodgy property dealing. Raylan gets into a fight with a couple of bar room loudmouths – "Because I didn't order assholes with my whiskey" – and is forced to endure the episode without his most powerful weapon: his 10-gallon hat. PO'N The Bionic Vet 10.45pm, BBC1 From his multimillion pound evil lair, Noel Fitzpatrick is engineering a dastardly plot to create a race of mechanically enhanced super animals primed to do his foul bidding and take over the world. That's getting ahead a little; for the moment Fitzpatrick's flimsy cover story is that he's a vet taking on cases such as a cat that lost two paws in a combine harvester and a labrador pencilled in for a trip to "a farm in Wales" if his crippling arthritis is unchecked. (Of course, he could just be the innovative and experimental vet this documentary claims him to be.) PO'N