Case C-393/10: Judgment of the Court (Second Chamber) of 1 March 2012 (reference for a preliminary ruling from the Supreme Court of the United Kingdom) — Dermod Patrick O’Brien v Ministry of Justice, formerly Department for Constitutional Affairs (Framework agreement on part-time work — Definition of ‘part-time workers who have an employment contract or employment relationship’ — Judges working part-time remunerated on a fee-paid basis — Refusal to grant a retirement pension)