“A countercultural sketch show full of unknowns, with no script, no structure.” The verdict of NBC’s head of talent about the embryonic Saturday Night Live expresses everything audiences loved about it when it first aired in 1975.

To capture the anarchic birth of this TV institution, Jason Reitman has made a stylish film that initially seems as wayward as the show. But it gradually comes to seem like the obvious way to handle the material.

Sheeps, Pleasance Courtyard ★★★

You may have seen Lazy Susan's excellent BBC pilot last year; now a series has been commissioned from Freya Parker and Celeste Dring so we can look forward to more sketches, surreal interludes and tiptop visual gags – as well as returning characters including Northern lasses Megan and Michaela, tottering on their heels to a night out where they “don't want any drama”.

Clive Anderson Assembly George Square ****

Nick Helm Pleasance Dome ****

What a pleasure it is that Nick Helm has returned to the Fringe after six years away after appearing in television comedies Uncle and The Reluctant Landlord.

Sheeps, the sketch comedy threesome, had never really gone away but when they performed Live and Loud Selfie Sex Harry Potter at the Edinburgh Fringe last year after a four-year absence, it was called a comeback. More a welcome reunion, as its members – Liam Williams, Daran Johnson and Alastair Roberts – had been busy doing solo projects.

The show, which they have brought to the Soho Theatre for a short run, is in the same vein as their previous work – original and intelligent sketch comedy with a touch of edginess and the surreal.

When the League of Gentlemen – Mark Gatiss, Reece Shearsmith and Steve Pemberton, plus non-performing writer Jeremy Dyson – reformed for an excellent series to update us on events in Royston Vasey (“portal to another world, or just a shit hole?”) for the BBC last year, they enjoyed it so much that they announced a tour for 2018, their first live show since late 2005.

The Bass Defence League campaigns for mental health. As with everything Big Narstie does, there are serious points in this release wedged next to the broadest comedy, and it’s no coincidence, as we learn from the vivid parody of “BDL Protest” intro skit, that BDL is only a letter away from EDL.

What joy that Dawn French and Jennifer Saunders were persuaded by the BBC to celebrate their 30 (ish) years as a comedy duo with this programme – and that this sweet confection was shown on Christmas Day. It was a pleasing mix of old clips and new material, and a reminder that when F&S are good, they are very, very good.