A vintage Cheddar sandwich is built on the longest-aged block of all, and the lead is depth rather than the sharpness of a mature block or the gritty crystal crunch of an extra mature one. A Cheddar held to a vintage age has concentrated as it lost moisture, and what comes forward is a long, savoury, almost meaty depth behind the acidity, a nuttiness and a deep umami that a younger Cheddar simply has not had the time to develop. The sharpness is still there, and so is some of the crystalline grit, but they are not the headline. The sandwich is organised around presenting a flavour that has been concentrated by the hang itself, the cheese at its most developed and least gentle.
The craft is the cut and a near-total restraint, because a vintage block is doing more talking than any other Cheddar and a heavy hand wastes the depth that is the entire reason to choose it. The cheese is sliced rather than grated and cut with real thickness, since a vintage Cheddar shaved thin loses the long savoury finish along with the crystalline texture and reads merely sharp. That depth needs nothing added to it and is easily flattened: a strong pickle or a sweet chutney that frames a milder Cheddar here competes with a cheese already at full concentration and buries the nutty, meaty length that distinguishes it. Butter to the edges stays structural, sealing the crumb and carrying the salt across, and a few minutes out of the fridge matters more here than with any softer cheese, because a vintage block straight from the cold is hard and waxy and the long savoury notes only open as it comes toward room temperature. The bread is soft and plain so nothing argues with a filling working at this depth.
The variations are almost entirely the question of whether to add anything at all to a cheese this concentrated. A thin smear of a quince or fruit paste can frame the depth without crowding it; a cave-aged or extra-vintage block pushes the savoury length and the crystal further still; the bare bread-and-butter reading is the cheese with nothing in front of it, which is how a block held this long is most often best met. Each deserves its own article rather than being crowded in here.