“…t as the more elaborate definition of “worker” in the legislation with which we are concerned: see Secretary of State for Justice v Windle [2016] EWCA Civ 459, [2016] ICR 721, at paras. 7-10 (pp. 723-5), discussing the judgment of Lady Hale in Bates van Winkelhof v Clyde & Co. [2014] UKSC 32, [2014] 1 WLR 2047.…”