R (UNISON) v Lord Chancellor (2017)4R (on the application of UNISON) v Lord Chancellor [2017] UKSC 51; [2020] A.C. 869; [2017] 3 W.L.R. 409; [2017] 4 All E.R. 903; [2017] 7 WLUK 601; [2017] 4 Costs L.R. 721; [2018] 1 C.M.L.R. 35; [2017] I.C.R. 1037; [2017] I.R.L.R. 911; [2017] H.R.L.R. 11 . (2017, July 26).