In 1723 he edited two folio volumes entitled Historiæ Anglicanæ Scriptores varii, e codicibus manuscriptis, of which both large and small paper editions were published. They contained the Chronicon Angliae Petriburgense, which later was attributed erroneously to John, abbot of Peterborough (1250–1262), by Simon Patrick and Henry Wharton. This was printed by Sparke from a transcript furnished to him by John Bridges of Lincoln's Inn, and, not having been collated with the original (among the Cotton. MSS. in the British Museum), contains errors. It was re-edited in 1845 for the Caxton Society by John Allen Giles. The Historiæ Anglicanæ Scriptores included also William Fitzstephen's Life of St. Thomas Becket, the History of Peterborough Abbey by Hugh Candidus, Walter of Guisborough's Vita Eduardi, and the chronicles of Ralph of Coggeshall, Benedict of Peterborough, and others. Another volume contemplated by Sparke was to contain Whittleseye's Hereward of Peterborough.
