 In addition to the many positions she has held, Thomas became an honorary fellow of the University of Wales Swansea in 1987 and of Cardiff University in 1998.She was also granted honorary doctorates in science from the University of Wales in 1992 and from the University of East Anglia in 2002.In 2009, she was ordained as an honorary fellow of Aberystwyth University in recognition of her distinguished career as a Welsh scientist.