Some corrections and additions to the Complete Peerage: Volume 2: Burgh (PROPOSED CORRECTIONS)

BURGH, BOURGH or BOROUGH (of Gainsborough)

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Volume 2, page 422:
He [Thomas Burgh (d. 1495/6)] m., between May 1462 and 1464, Margaret, widow of William, LORD BOTREAUX, da. of Thomas (ROS), LORD ROS, by Eleanor, da. of Richard (BEAUCHAMP), EARL OF WARWICK.

Thomas Burgh's wife Margaret was certainly the daughter of Thomas, 8th Lord Ros (d. 1430) by his wife Eleanor Beauchamp. On the identity of Margaret, wife of William, Lord Botreaux, see Botreaux, vol. 2, p. 242.