This must-see addition to the Cold War spy genre leans heavily on the visual and stylistic tropes established by the definitive 1979 BBC dramatisation of John Le Carre's 'Tinker, Tailor, Soldier, Spy'.

The lighting, settings, dialogue and pacing all pay homage to this classic series.

The production is absolutely sumptuous, with no expense spared. Beautiful photography, set decoration, locations and a legion of telephone boxes, pillar boxes and handily placed furniture vans (together with a cavalcade of vintage vehicles, archive footage and outstanding CGI matte shots) transform modern-day London and Bucharest into the Europe of the 1940s, 50s and 60s.

The narrative is often difficult to follow. Some streamlining and signposting of the plot would help. I watched all six episodes back-to-back and, at times, it felt like I was reassembling the shredded CIA files after the Fall of Saigon. One dark, wintery street, full of shuffling brown shapes, looks much like any other.

But the acting is top-notch. BAFTA-worthy performances from Anna Maxwell Martin, Damian Lewis and Guy Pearce, and the story really rewards those who stick with it. Plaudits for the original score too.

Heartily recommended, though, for multiple viewings, I'd opt for Alec Guinness every time.