Kennicutt-Schmidt relation using the α_[CII] conversion factor (left) and the W_[CII] version (right). The grey contours show the distribution of individual pixel measurements across the entire sample; the pair of points are the B23 region averages for individual galaxies, colour-coded by redshift. The dashed grey lines show constant gas depletion time. The dashed black line represents the Wang et al. (2022) KS relation for local Universe and high-redshift main-sequence galaxies. We show CO measurements of the global KS relation from the low-z COLD GASS sample (Saintonge et al. 2012, crosses) and at redshifts up to z ∼ 2.5 from the PHIBBS (Tacconi et al. 2013, plus signs) and PHIBBS2 (Freundlich et al. 2019, three-branch stars) programmes, together with a resolved z = 2.6 lensed starburst (Sharon et al. 2013, red points).