In the United Kingdom, a territorial designation follows modern peerage titles, linking them to a specific place or places. It is also an integral part of all baronetcies. Within Scotland, a territorial designation proclaims a relationship with a particular area of land.
A territorial designation is an aspect of the creation of modern peerages that links them to a specific place or places, at least one of which is almost always in the United Kingdom. It is given in the patent of creation after the actual peerage title itself, of which it is not a part. It is also an integral part of all baronetcies.
For instance, the life peerages conferred on the former Prime Ministers Margaret Thatcher and James Callaghan were created as Baroness Thatcher, of Kesteven in the County of Lincolnshire and Baron Callaghan of Cardiff, of the City of Cardiff in the County of South Glamorgan. The part of the peerage before the comma is the actual title, and the part after the comma is the territorial designation. These peers should be referred to as The Baroness Thatcher and The Lord Callaghan of Cardiff: it is incorrect both to use part of the territorial designation as part of the title and to leave out part of the actual title; thus The Baroness Thatcher of Kesteven and The Lord Callaghan are incorrect, although the latter may be used informally.
Some territorial designations name more than one place, and the format used depends on whether such places are in the same county or other administrative division. For instance, the life peerages conferred on Margaret McDonagh and John Morris were created as Baroness McDonagh, of Mitcham and of Morden in the London Borough of Merton and Baron Morris of Aberavon, of Aberavon in the County of West Glamorgan and of Ceredigion in the County of Dyfed. Occasionally, a place outside the United Kingdom can be named: for instance, the life peerage conferred on Howard Florey was created as Baron Florey, of Adelaide in the Commonwealth of Australia and of Marston in the County of Oxford, or the life peerage conferred on Sue Ryder was created as Baroness Ryder of Warsaw, of Warsaw in Poland and of Cavendish in the County of Suffolk.