Sir Francis Walsingham was both Elizabeth1st's secretary from 1572 and MP for LymeRegis in the early years of her reign.  He was a  vehement anti-catholic who had a network of spies.  His spy in Lyme Regis was a man named Arthur Gregory who had a genius for opening letters and resealing them, which of course, in those day involved repairing the broken seal.  It is likely that he supplied at least some of the evidence to Walsingham of the alleged plot which led to the execution of Mary Queen of Scots at Fotheringay Castle in the year before the Spanish Armada (1588) at a time when the fear of a Catholic plot backed by Spain was at its height. Later in 1619 Gregory became Mayor of Lyme Regis.