Testing many treatments within a single protocol over 10 years at MRC Clinical Trials Unit at UCL: Multi-arm, multi-stage platform, umbrella and basket protocols by Parmar, MK, Sydes, MR, Cafferty, FH, Choodari-Oskooei, B, Langley, RE, Brown, L, Phillips, PP, Spears, MR, Rowley, S, Kaplan, R, James, ND, Maughan, T, Paton, N, Royston, PJ