More may be added to the earlier biography.
In the spring of 1423 Thomas Kempston* of Bedford gave Sperlyng a recognizance as a security for a debt of £10 he owed the MP, but the circumstances in which the debt was contracted are not known.
Sperlyng was more closely associated with Humphrey, duke of Gloucester, than previously realized, since he was steward of two of the duke’s lordships in Berkshire. Furthermore, his stewardship of certain lordships belonging to Richard Beauchamp, earl of Warwick, in Buckinghamshire, was not the only such office he held under that lord, whose steward at Spelsbury in Oxfordshire he was when he died.
At the controversial Buckinghamshire election of 1429, 126 men attested the return of Sperlyng and John Hampden II* as knights of the shire for that county,
An account roll from the late 1450s shows that Sperlyng’s holdings in Wycombe had included a water mill, for which he had paid the manor of Bassetsbury an annual rent of 30s.
