More can be added to the earlier biography.
But appears to have had interests in the tin trade, for he occasionally appeared in the court of the stannary of Blackmore, engaged in litigation with other local merchants.
Like other fifteenth-century under sheriffs, But was accused of malpractice in office, in his case during the course of his service as Sir John Grenville†’s deputy in 1410-11. At the Cornish assizes of March 1411 it was claimed that he had been guilty of packing juries at the naming of third parties.
Through his office of deputy havener, if not otherwise, But came into contact with the long-serving steward of the duchy of Cornwall, Sir John Arundell I* of Lanherne, on whose good lordship as an arbiter of disputes he relied in the second half of the 1420s.
