From the Genealogy Lady Archives comes this question and answer:
Question: My grandfather Claro Mayo Recto was a descendant of Ferdinand Mayo from Liverpool. He was an Irishman in the servce of the English occupation army stationed in the Philippines in 1762. When the English forces left, the Irishman stayed behind and settled down in Batangas. I am trying to find out the name of the regiments of the English army that were stationed in the Philippines at that time. On his father's side, Claro was a descendant of Claro Sr who was a sergeant in the Spanish forces in the Philippines in the late 1800's. How can I locate Spanish military records for that period?
GENEALOGY LADY: You can locate British Military Records at the PRO. Ruskin Avenue Kew, Richmond England. They do not do searches however and you may have to hire a researcher to do this for you. Their records are very extensive and you would have a fairly good chance of being succesful of finding documents pretaining to your ancestor. To find the name of the regiment I would write the Society of Genealogists 14 Charterhouse Buildings, Goswell Road, London, EC1M 7BA with the information you have given here. You could check with the nearest Family History Center to see what military records are available. I have never done any research in Spain but upon consulting one of my books it indicates the following" In the Military Archives in Segovia you can find the complete records of every Spanish soldier from the early 1600s to the present day. The lists have been indexed and published." My reference book does not give the address but the Instituto de Genealogica Y Heraldica de Espana, Quintana 28, Madrid, 28008 Spain should be able to help you with your inquiry.
I note with interest the fact that the English ancestor was a "Ferdinand" Mayo, before the Spanish/Phillipine excursion.
The Genealogy Lady is a good resource for searching. You can find the MAIN PAGE here: http://www.new-jerusalem.com/classics/genladynew/