The Abbey is, essentially, the Sacring Place of English Kings and - since the invention of the 'United Kingdom' - of the monarchs of that constantly fluctuating institution, the 'United Kingdom'. It is rendered suitable for the former purpose by the presence of the shrine of S Edward the Confessor.
There was, at the beginning of the modern era, an attempt to make the Abbey something more. In 1485, Henry Tudor had, with very scant title, seized the throne of England. Marrying a Yorkist heiress did nothing to suppress agitation by those who wanted a Sovereign of the Blood Royal (indeed, his new mother-in-law joined those who were plotting against him); and, since Nature abhors a vacuum, whenever he executed Plantagenets, low-born Pretenders emerged from the woodwork. Foreign monarchs were cautious about betrothing daughters to the family of such a parvenu and unstable 'monarch'.
So he attempted to embellish his tenuous claim in two ways. By calling his son Arthur, he attempted to cast over his dodgy dynasty the mantle of the Once and Future King. And another name with incantatory potential was that of 'Henry'. Accordingly, the old Lady Chapel of the Abbey was demolished so as to be replaced by a new spectacular perpendicular chapel, where Tudor and his family were to be buried, but which, technically, was to be the shrine of a great royal saint who would match the S Edward who was enshrined nearby. Pope Julius issued bulls authorising the introduction of the cause for the canonisation of Henry VI (just as 'the divorce' was to be Henry VIII's Great Matter, so the canonisation was the Great Matter of Henry VII), and for the translation of his body from Windsor to this new chapel. Henry VII was seeking to cloak himself in the aura of the saintly Lancastrian, 'our Uncle of blessed memory', whose name, and whose descent from Catherine de Valois, he shared; and the very steps up to the chapel were to be endowed with indulgences. The building was adorned with all that was most sumptuous in the decorative arts of medieval England and of renaissance Italy.
Hindsight informs us that there never was to be either a Tudor King Arthur I or a canonised Saint Henry VI to swell the pilgrim numbers in the Abbey; that the England of popes, pardons and chantries had less than forty years to run. But things seemed quite different at the start of the sixteenth century.