De Ufford was sent, along with Nicholas de Luna and Hugh Neville to
Avignon in the summer of 1344 as envoys to a council held by Pope
Clement VI to mediate peace during the Peace of Malestroit (January 1343 – September 1346), a breathing space for both sides during the
Hundred Years War. The mediation came to naught. De Ufford was the chancellor to Edward III, keeper of both the great seal and the privy seal. He was entrusted with the privy seal in 1342 (thus becoming
Lord Privy Seal), and the great seal on 26 October 1345, which was the duty of the
Lord Chancellor. He resigned the office of Lord Privy Seal after 29 September 1344, ==Archbishop of Canterbury==