An extra-large, round, flat bread-roll cut horizontally to
make a sandwich, within which most often is served
the Full English Breakfast. Full title might be "dustbin lid," named after the dustbin refuse receptacle of around 90 litres that predates the wheeliebin era. The lids are round and 50cm across, (20'' in old-money), the breads they're named after not as large, more like face-sized, but so called for
exaggerated comical effect.