Sources

1) Source: The History of Parliament . External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/beauchamp-sir-william-1421. Reference: Beauchamp, Sir William (d.c.1421), of Powick, Worcs. and Alcester, Warws. (Unreliable evidence or estimated data)
2) Source: Special Collections: Ancient Petitions "Petitioners: Katherine Beauchamp, wife of William Beauchamp; William Bekwith (Beckwith); Joan Beckwith, wife of William Bekwith; Thomas Busoigne; Anne Busoigne, wife of Thomas Busoigne; Robert Haldenby; Isabella Haldenby, wife of Robert Haldenby...Nature of Request: The petitioners, as heirs of Gerard Ufflete, request their rights in his lands, occupied by the duchess of Norfolk."Dated: 1416-1425. External Link
http://discovery.nationalarchives.gov.uk/details/r/C9295320. Reference: SC 8/189/9442 (Data from direct source)
3) Source: Testamenta eboracensia; or, Wills registered at York The will of Gerard de Usflete dated 5 September 1405 and proved 5 April 1406. (Questionable reliability of evidence)
4) Source: The History of Parliament . External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/usflete-sir-gerard. Reference: Usflete, Sir Gerard, of North Ferriby and Ousefleet, Yorks. (Questionable reliability of evidence)
5) Source: Savile of Rufford: Deeds and Estate Papers "Chirograph: Marriage settlement - Henry de Nuhill clerk to Brian of Thornhill on marriage of Gerald son of Gerard de Ufflet and Margaret daughter of Brian, lands etc in Swanland and Ufflet."Dated: 1357-1368. Reference: DD/SR/209/124