Which building is not home to one of the four surviving original copies of the 'Magna Carta'?

The Westminster Abbey is not home to one of the original copies of the 'Magna Carta'.

'Magna Carta Libertatum' (Medieval Latin for "the Great Charter of the Liberties"), commonly called 'Magna Carta' (also 'Magna Charta'; "Great Charter"), is a charter of rights agreed to by King John of England at Runnymede, near Windsor, on 15 June 1215. First drafted by the Archbishop of Canterbury to make peace between the unpopular King and a group of rebel barons, it promised the protection of church rights, protection for the barons from illegal imprisonment, access to swift justice, and limitations on feudal payments to the Crown, to be implemented through a council of 25 barons

At least thirteen original copies of the charter of 1215 were issued by the royal chancery during that year, seven in the first tranche distributed on 24 June and another six later; they were sent to county sheriffs and bishops, who were probably charged for the privilege. Slight variations exist between the surviving copies, and there was probably no single "master copy". Of these documents, only four survive, all held in England: two now at the British Library, one at Lincoln Cathedral, and one at Salisbury Cathedral. Each of these versions is slightly different in size and text, and each is considered by historians to be equally authoritative.