He wrote a survey of the postal history, postage stamps and postmarks of the Cayman Islands with Philip Saunders that was published in 1962 and became a standard work on the area.

[2] His activities during the Second World War are unknown but in 1948 he attended the 30th Philatelic Congress of Great Britain in Bournemouth and from 1949 to 1958 he edited and published the British West Indian Philatelist, which publication was printed by the Gleaner Company, of which his elder brother Vincent Newton Aguilar was chairman.

In 1958, he was appointed the West Indies commissioner for the London International Stamp Exhibition 1960, and in 1961 attended the 43rd Philatelic Congress of Great Britain at Blackpool with his family.

[2] From around 1960 he ran The Green Thumb, a florist's shop in Kingston's Old Hope Road that had previously been owned by his brother Andrew Horatio Bastion Aguilar.

David Horry describes it principally as a vehicle for Aguilar to air his feuds with the Jamaican post office and government, stamp printers, and the large London dealers Stanley Gibbons by whom he felt slighted.

He proposed ideas for several stamp issues which were ignored or rejected, such as after the death of James Bond creator and Jamaica resident Ian Fleming, and tighter processes at the Post Office made it harder for him to produce the covers for sale to collectors which formed an important part of his trade.