Christa was appointed as a fee paid Employment Judge in 1995. She became a salaried Employment Judge in 2003, assigned to sit in the Employment Tribunal in Exeter and then Bristol. She was Director of Training for Tribunals for the Judicial College, Editor of the Tribunals Journal between 2016 and 2020 and Deputy Director of Training for the Employment Tribunals (E&W) between 2009 and 2016.