The Shropshire Blue sandwich is defined by the gap between how the cheese looks and how it tastes. Shropshire Blue is a striking deep orange, coloured with annatto, shot through with blue veining, so the eye reads it as rich and mellow before the mouth corrects the impression: it is a firm, creamy blue with a sharp, salty, mineral bite and a tang that has nothing soft about it. The sandwich is that cheese on plain bread with butter underneath and one counter, and the defining fact is the contradiction the colour sets up. The orange suggests a gentle cheese; the blue delivers a pointed one, and the build is arranged to let the bite come through rather than be muffled. The cheese is both the structure and the flavour, and the rest of the sandwich exists to frame an assertive blue, not to soften it.
The craft is the crumble and the counter. A firm blue like this is crumbled rather than sliced so its salt and its veined sharpness distribute evenly across the bite instead of arriving as one concentrated, mouth-filling slab. Butter to the edges does two jobs: it bridges the cheese's salt and fat to the wheat of the bread, and it waterproofs the crumb so a sweet counter does not soak through and turn the base to paste. The bread is plain and soft because a blue this loud needs no help and a strongly flavoured loaf would only argue with it. The counter is calibrated to the bite: a sweet element, pear, fig, chutney, or a smear of honey, set against the salt the way blue cheese is traditionally met, applied in a measured amount so it answers the sharpness rather than burying it.
The variations are the rest of Britain's blue and regional cheese shelf met with the same plain frame. Stilton crumbled with celery or pear is the close cousin; Stichelton, Dorset Blue Vinney, and the harder territorial Cheddars are the same logic with a different cheese. Cheese and pickle, cheese and onion, and the ploughman's that sets the wedge against bread and chutney rather than slicing it all keep the founding rule. Each of those deserves its own article rather than being crowded in here.