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tokens: This paper is based on observations collected at the European Southern Observatory Very Large Telescope, Cerro Paranal, Chile – Programs 166.A-0106, 079.B-0469, 185.A-0745, 092.A-0170. We are indebted to an anonymous referee for helpful comments that clarified several points in the paper. VD is grateful to Gwen Rudie for sharing and adapting her results on the KBSS for Fig. 9 . MV is supported by the ERC Starting Grant ‘cosmoIGM’ and PD51 INDARK grant. TSK acknowledges funding support from the ERC Starting Grant ‘cosmoIGM’, through grant GA-257670. MH was supported by the ERC Advanced Grant 320596 ‘The Emergence of Structure during the epoch of Reionisation’. PB is supported by the INAF PRIN-2014 grant ‘Windy black holes combing galaxy evolution’. Parts of this research were conducted by the Australian Research Council Centre of Excellence for All-sky Astrophysics ( CAASTRO ), through project number CE110001020 .