The roast dinner Yorkshire wrap is the whole Sunday plate rolled inside a single giant Yorkshire pudding, and the defining decision is containment rather than bread. A large, thin Yorkshire pudding is baked flat and flexible enough to fold, then loaded with roast meat, roast potatoes, vegetables, stuffing, and a ladle of gravy, and wrapped closed so the entire dinner can be carried and eaten in one hand. There is no loaf anywhere in it. The pudding is the wrapper, the starch, and the flavour all at once, which is what separates this from the bread version where a Yorkshire pudding sits inside a sandwich. Here the pudding is the sandwich, and the test is whether one fold of batter can hold a full roast dinner together on a walk.
The craft is engineering a wet, mixed, heavy filling into a single seam. A rolled wrap is a sealed cylinder, and a roast dinner is about the wettest filling there is, so the gravy is the controlled risk: enough to bind and carry the load, not so much it blows the seam and runs out the end. The pudding has to be baked thinner and more pliable than a plate Yorkshire so it folds rather than shatters, and it is loaded along a line with the drier components, meat, stuffing, crushed potato, doing the structural work and the gravy held in the middle where the fold can contain it. Warm assembly matters: a cold pudding cracks at the fold, a warm one bends. The reward is the entire roast in the texture of one bite, soft potato, tender meat, herby stuffing, the gravy held just short of escape.
The variations are the carvery menu poured into the same fold. Beef with horseradish, chicken or turkey with stuffing and cranberry, pork with apple and crackling: each swaps the roast and keeps the giant-pudding containment. The version where a piece of Yorkshire pudding sits inside a conventional bread sandwich is its own thing, distinct from this wrap, and the bagged street-festival builds with extra gravy on the side are a wetter reading again. Each deserves its own article rather than being crowded in here.