... I had a driving job in the West Midlands and we used to visit a greasy spoon every morning after leaving the yard.
This particular establishment (called The Greedy Pig, but I'm buggered if I can remember exactly where it was) did five sizes of breakfast ranging from tea plate sized (half a sausage, one egg, one small slice of black pudding, one slice of fried bread, half a tomato and a tea spoon of baked beans) right up to something served on a plate usually used for bringing a family sized turkey to the dinner table. Basically three full sized breakfasts and a row of pork chops, accompanied by half a loaf of bread.
I never tried it, but it probably explained why the HGV drivers you met who were over forty were also round.