The claimants in the Employment Tribunal had been chosen as representatives of judges at various levels who had brought similar claims.
Each of the claimants occasionally sat as judges at a higher level than their usual position (known as ‘sitting up’). For example, circuit judges were asked to ‘sit-up’ as high court judges on occasion. They claimed that, when sitting up, they were part-time workers and should not be treated less favourably in terms of pay than comparable full-time judges in the higher court.
Their pay was lower than that for full-time judges in the higher court and they didn’t get a pro-rata uplift for the time they spent ‘sitting up’.