Verdict: Very high quality at gourmet burger prices.
The Diner is one of a chain of seven around London, each set up to feel like a 1950s American style Diner, albeit a 1950s American style Diner perhaps imagined by some vague historian in a distant dystopian, minimalist, future, sci-fi world. All the elements are there, the booths, the soundtrack, the americana, the garish lighting, the neon. All just sitting in the uncanny valley somewhere between The Fifth Element and IKEA.
That said, the food is really good. Quality ingredients, well prepared an plenty of them. The sides are huge and well cooked. I have honestly never left The Diner in any way hungry. The selection of drinks is wide, from quality micro brewery beer & cider to ‘hard shakes’. Definitely one of the best burger joints around London but at a price just a bit too premium to be regularly visited, save it for special occasions.