Joined Cases C-131/04 and C-257/04: Judgment of the Court (First Chamber) of 16 March 2006 (references for a preliminary ruling from the Court of Appeal, Employment Tribunal) — C.D. Robinson-Steele v R.D. Retail Services Ltd (C-131/04) — Michael Jason Clarke v Frank Staddon Ltd (C-257/04) and J.C. Caulfield, C.F. Caulfield, K.V. Barnes v Hanson Clay Products Ltd, formerly Marshalls Clay Products Ltd (C-257/04) (Social policy — Protection of the health and safety of workers — Directive 93/104/EC — Entitlement to paid annual leave — Inclusion of payment for annual leave in the hourly or daily remuneration ( rolled-up holiday pay )