Cumulative distribution of LFBOT host galaxy metallicities is shown in orange (see Table 1). We sample the Z values, assuming Gaussian uncertainties, 100 times, producing the many realisations of the cumulative distribution shown. Cumulative distributions of our selected progenitor metallicities, weighted by the CSFH(Z) at z < 0.4, are also shown. The black line is the z < 0.4 mean metallicity distribution of star-forming galaxies Langer & Norman (2006). The grey shaded region bounded by dashed lines is defined by shifting the distribution of Langer & Norman (2006) by ±0.2 in 12+log₁₀(OH), covering the high- and low-Z extremes defined by Chruslinska & Nelemans (2019).