Direct evidence of a struggle between two Tudor politicians for the same office is rare in itself; the more so over the Admiralty, because it seems only to have been in Mary's reign that appointment to this office was politically contentious. The replacement of Lord Clinton is documented from the State Papers Foreign simply because his chosen successor Lord William Howard was then serving as Deputy of Calais [II.5–7].

The Queen's marriage to Philip of Spain created an unprecedented constitutional uncertainty, never fully resolved. Unlike the consorts of later Queens Regnant, Philip had the title of King, and all official documents were issued jointly by the King and Queen. Philip's kingship was also expressed in regnal years running in complicated canon with those of his wife. Yet it was never clear just what power Philip had in his own right. While he was in England he acted jointly with the Queen; when he was in Brussels (which was most of the time) she sought his advice on all important issues. Philip also maintained direct contact with English ministers, including the Lord Admiral. For some while after his first departure in September 1555 he communicated (in Latin) with a select group of Privy Councillors, returning their regular reports with his minuted decisions and comments. One such exchange [II.8] shows the King acknowledging the Royal Navy's fundamental value to the nation's defence. Though there is a certain irony in this observation from the future sender of the Invincible Armada, the second half of Philip's reply reveals his real interest. The English fleet now under his control was a valuable accession in protecting the passage between Spain and her territories in the Low Countries. There was, however, a failure in providing a suitable escort for Philip's own crossing to Calais, prompting a frosty rebuke to the Lord Admiral [II.9]. Soon afterwards the Privy Council ordered a thorough review and overhaul of the navy, though the only direct evidence of this is an entry in the Council Register [II.10]. A year later this was followed by a radical reform of naval financing, replacing piecemeal supply with a fixed budget. For this we have only the registered decision [II.11], with no indication of the debate which prompted it.