The Bedfordshire clanger is a sandwich that engineers two courses into one sealed object. It is a long suet pastry roll, filled savoury at one end and sweet at the other, crimped shut along its length so the two fillings never meet. That partition is the whole idea. It is not a pasty with an unusual filling; it is a deliberate piece of two-course design, a main and a pudding built into a single thing a worker could carry to a field and eat from one end to the other without unwrapping a second item.
The craft is in the pastry and the divide. Suet crust is used because it is sturdy and tolerant: it holds a wet filling through a long bake without splitting and survives a coat pocket or a lunch tin the way a delicate shortcrust would not. The fillings go in raw or part-cooked because the bake time is set by the pastry, not the centre, and the seam down the middle has to be sealed well enough that a savoury end of meat and potato and a sweet end of fruit or jam stay strictly separate through that bake. A scored or marked crust over one end tells the eater which is which, because once it is sealed and baked the two halves look the same and biting into the wrong one is the failure the whole design exists to prevent. It was built for people who needed a hot, self-contained meal that lasted a shift, and the engineering still shows it.
The variations stay inside the sealed two-course frame. The classic runs meat and vegetables at the savoury end and a stewed fruit such as apple at the sweet end; a bacon-and-egg savoury end makes it a breakfast clanger; jam or mincemeat at the sweet end is the common pudding swap. The wider pasty and bridie family shares the sealed-crust logic without the two-course divide. Those deserve their own article rather than being crowded in here.