Named both as an allusion to the Sylvester McKoy 'Fang Rock' story and a descriptor of the early 70s, this story is set in a motorway services late at night when the only occupants are kitchen staff, various glam rockers travelling post gig and some monsters trying to break their way in, apparently to destroy everyone inside. Into this maelstrom (did I mention the snow storms?) coem the Doctor and Lucie.
There is a lot to like about this:
1) We meet Lucie's Auntie Pat as a young woman who reappears next season in the Zygon who Fell to Earth, another rock & roll story
2) Bernard Cribbens is excellent as the dodgy dealer manager who comes good right at the end
3) The location - why are more stories not set in a service station? This is clearly the UK equivalent of a motel - random visitors, isolated, lots of corners. I really like that this is one of the services with the bridge over the motorway where the story culminates.
As to the series, yes this is a one-off but note that relations between the Doctor and Lucie are much improved as they grow more used to each other.
I orignally gave this four stars, but have now decided it's a five; I may even listen to it again soon!