 On 24 June, Delves wrote to the Earl of Rutland "There is no man of life and agility in every respect in the Court but the Earl of Oxford".In 1578, Delves and Sir William Fitzwilliam were appointed by letters patent as alnagers and collectors of customs duties on the transport of 'New Draperies', a potentially profitable position which was to be held for seven years.In the event, they held their patent for a great deal longer, the actual work being done by deputies.