For six years Llinos has been the Headteacher of Ysgol Gyfun Gymraeg Bro Myrddin and has worked in education since 1987. She leads a pioneering school, is an NPQH assessor, NQT external verifier and sits on the WJEC Wales headteachers reference group and the Welsh Government Primary-Secondary transition group. She is also chairman of CYDAG.