It would have to be something by Keith Roberts, but which one?
Probably either The Chalk Giants (interlinked stories about the rise of civilisation after an atomic war. Or maybe about the dreams, thoughts fears and fantasies of the protagonist of the first story. Who may be dead anyway.) Its a difficult read and relentlessly downbeat, but brilliantly written.
Or Kaeti and Company in which Roberts did seriously what Spike Milligan did for laughs in The Goon Show - created a group of characters (the most memorable if which is Kaeti herself) and then dropped them into different situations, some realistic and some fantastic (A ghost story, for example - another is an anti-captal punishment story parts of which read like Alan Moore's V). In the parts between the stories, Kaeti interacts with the author and reader, complains about her scrip for the next story and even flirts. In the last story, she walks out of the book and into the 'real' world. It's a fantastic tour-de-force of writing.