Thank you so much to Jean Pascal for sharing this news with me. A letter written by Henry VIII to Francis I in 1539 is being auctioned in Lyon on 15th December. You can find out more at http://www.debaecque.fr/html/fiche.jsp?id=6623048&np=1&lng=fr&npp=10000&ordre=&aff=&sold=&r=, but in the letter the King of England complains about acts of piracy on English ships off the coast of Dieppe.
Wouldn't you just love the letter?!