It’s the worst outing yet for the Slough House gang, with main characters having unnerving personality transplants and ‘action’ sequences taking place in penguin enclosures. Yikes!The fifth season of Slow Horses starts with a timely sequence: a gun attack perpetrated by a follower of a far-right politician (we even briefly glimpse a few St George’s crosses). Rightwing politics is an area that Apple TV+’s spy drama has tackled before; back in season one, a British-Pakistani student was memorably taken on a joyride by a nationalist group named Sons of Albion, who threatened to behead him on a live stream.However, like many things in the Slow Horses universe – based on Mick Herron’s bestselling novels about a group of MI5 rejects – the opening proves something of a red herring. Season five isn’t really about white nationalists, or environmental activists, or hostile foreign actors, and yet it is also about all of those things, all at once. As a result, it is overstuffed and strangely l...