In his later career, Fôn has concentrated on appearing on stage and also adapted the play Blackbird for a production by Theatr Bara Caws in which he starred in 2010.

A campaign of arson attacks linked to the Welsh language movement began in December 1979, which involved burning down English-owned holiday homes in Wales.

Fôn wrote a song belittling the police's unsuccessful attempts to catch those responsible.

In 1990, several detectives visited his home and he was arrested along with his partner, Anna, after they discovered a package hidden in a wall on his cottage's land.

[3] In January 2011, it was announced that Bryn Fôn was one of a hundred people who had refused to pay their TV licences as part of the Cymdeithas yr Iaith Gymraeg protests against plans to cut the budget of the Welsh-language TV channel, S4C, and the plans to transfer control over the channel to the BBC.