She began her higher education at Aberystwyth University, but left prior to completing her studies to go and work for Cymdeithas yr Iaith Gymraeg.

She won the crown at Eisteddfod yr Urdd in 1982, with Hen Fyd Hurt, which can be translated as "Silly Old World" and contains Tomos's reflections on her experience when unemployed.

The children's books she has written and illustrated include the Rwdlan (To prattle) series of 13 self-illustrated volumes set in Gwlad y Rwla.

[1] She had attempted to climb the Crystal Palace TV transmitter to express concern about the lack of television broadcasting in Welsh.

The title derived from a theme song of the 1980s cultural movement written by Dafydd Iwan as a rebellious response to lost elections for a Welsh assembly in 1979.

Titrwm (1994) takes the form of a prose song, soliloquising the story of a deaf, mentally impaired woman called Awen (meaning Inspiration).

Her communication problems symbolise the political situation in a marginalised Wales and like Awen, symbolically raped by an Englishman (subsequently killed by her brother).

She refers to Welsh cultural heritage, such as myths, heroes and heroines, songs and poetry, all set in a broader global context.