Don't really know if it's accessible in Britain.The corect music for this warlord would be polyphonic vocal bands from Epirus or traditional folk songs from Epirus accompanied by the Greek version of the clarinet.Alternatively, the polyphonic vocal music and bands of southern Albania are very similar to their northern (Epirus is in the north and shares a common border with southern Albania) Greek counterparts.Besides Kapetan-Markos was a fluent Albanian speaker and the situation near the Greek-Albanian borders (back then non existent as both countries were Ottoman provinces) were much like the situation in the middle marches in 16th or 17th century Britain.The Souliotes and their Albanian counterparts were very much like the English and Scottish border reivers.
Just a warning though,this music would probably sound very alien to anyone not accustomed to it ( most of the 18th and 19th century foreign travellers in Greece certainly thought so and made comments about it in their memoirs).After some time though and if you can get someone to translate the lyrics for you,it becomes evident that it is a form of music and song with profound and ancient origins full of pure Doric simplistic beauty.
Oda.