View source for Douglas Richardson, awaiting answers

===Question 8===
Will Johnson points out (1 November 2007) how Douglas Richardson in his Plantagenet Ancestry, Page 302 recorded :  "15.Anne (or Agnes) Gascoigne married Thomas Fairfax (will dated 1520 proved 1521), son and heir of Thomas Fairfax, Master of the Horse to King Edward VI...", and that this was impossible (as Edward VI wasn't born until 1537). To this Leo van de Pas added : "Dear Will, Could this be a simple typo? The son was born about 1476 and it is his father who was Master of the Horse. Could it be that Edward IV (king 1461-1470 1471-1483) who was meant?"