Scrag end, also known as the Windsor cut, is the name of a cut of lamb and mutton, common in the UK and the Commonwealth. It is a primal cut, thus is separated from the carcass during butchering.
Scrag end Wikipedia
Scrag end is one of the cheaper cuts of meat, and can be used in soups and stews. In the US, scrag end is known as the neck. Unlike scrag end, cutlets come from the part of the neck considered best, known as the middle neck.