Simulations of possible redshift evolution in the SFR-L_{150 MHz} relation using: (a) a mass-independent input relation of the form given in Eq. (1), and (b) a mass-dependent input relation of the form given in Eq. (2). The method used to obtain these figures is identical, and only the mass-dependent simulation reveals an upturn in L_{150 MHz} at lower SFRs, as seen for the real data set analysed in Fig. 8 (see that caption for further details).