Lock TITJUR Opinion of Mr Advocate General Bot delivered on 5 December 2013. # Z. J. R. Lock v British Gas Trading Limited. # Reference for a preliminary ruling: Employment Tribunal, Leicester - United Kingdom. # Social policy - Organisation of working time - Directive 2003/88/EC - Right to paid annual leave - Composition of remuneration - Basic salary and commission according to turnover realised. # Case C-539/12.