The beef might be Aberdeen Angus or "coarse-ground". It's not a mere cheeseburger, but instead "topped with Taw Valley cheddar". Other adornments might include guacamole, harissa or pancetta. You can have your burgers in brioche or ciabatta. The chips are "hand-cut" or "triple-cooked".
In specialist burger restaurants, the meat can be mixed with bone marrow and presented in a juicy, sloppy mass that seems almost unrelated to standard fast-food fare.
http://www.bbc.co.uk/news/magazine-23079694
(10 Pounds is more or less $15 US)