Miranda read archaeology at Cardiff University for her BA degree. She undertook a postgraduate Masters study for an M.Litt. on the Religions of Civilian Roman Britain at Oxford University, and was awarded a doctoral scholarship at the Open University, where she completed a PhD thesis entitled The Wheel as a Cult-Symbol in the Romano-Celtic World.

Miranda has been fortunate enough to have been invited to lecture all over the world, at universities in many European countries and in venues as far apart as Toronto and Sydney, and at the Smithsonian Institution in Washington DC and the Walters Art Gallery, Baltimore. She is a regular contributor to summer schools at the University of Complutense, Madrid and is a member of the Committee for the Study of Celtiberian Iconography. In 2004, she was invited to deliver the prestigious annual Kroon Lecture at the University of Amsterdam.

Until recently professor of archaeology at Newport University, Miranda's teaching experience ranges from leading undergraduate courses on Roman Britain and Iron Age Europe to managing and contributing to Newport's MA in Celto-Roman Studies. She has supervised more than twenty PhD and MPhil students to successful completion.