sentences:  In Great Britain, where construction materials are less plentiful, Roman structures were quarried for their stone and brick and it was commonly reused.Examples of this type of reuse in Great Britain can be found in Anglo-Saxon churches at Brixworth, Corbridge, St. Martin's, Canterbury, and St Nicholas', Leicester, and also in St Albans Abbey church (now St Albans Cathedral).Modern "Roman" bricks were introduced at the beginning of the 20th century.