In the "Colleccao das Ordens do dia do ... Senhor G. C. Beresford ... Anno 1809(-1823)"
1809 volume p22,23 there are agregados of British officers , example " Major do regimento de Infanteria #3 o capitao Henrique Pynn."
Also in volume 1810, pp 120,143,182,183,194. More British officers listed for Agregados at varying ranks from lieutenant up to colonel.
(There is a section on reformados and agregados for the spanish army in Clonard, Historia organica de las armas de Infanteria y Caballeria Espanolas, Volume V, p285,286 - there was probably a fair degree of similarity on the matter of these apointments between Spain and Portugal)
In English it seemed as if the British officers were transferred to the Portuguese army with an increase in rank. I had previously asumed they just went straight in with the full serving and rank. From the look of these orders they were instead "attached" and did not fully serve with all the administrative duties.
That raises a question of would there then be a portuguese capitao for each company, so in combat did the British officer line up in the rear with the supernumaries, or did they take a combat role in the front line leaving the portuguese officer to fall in behind. And did the British officers get counted in the portuguese figures for Present and casualties.
Why does finding out more always raise more questions ?????