Top: Redshift distribution of 16 BLLs at z > 0.6 from this work (filled area) and from the whole set of 57 objects including this work and those (41) with known z from Table D.5 that are in 4LAC and BZCAT catalogues (shaded area). Bottom: Spectroscopic redshift lower limit distribution of 11 objects from this work with z > 0.6 based on intervening absorption systems compared with the lower limit distribution of all 27 sources (objects in this work plus 16 lower limits in the catalogues 4LAC and BZCAT).