necessity numerous uncertainties and limitations in the $S^{3}$–SEX simulation, including but not limited to issues such as the form of the high-redshift evolution of the AGN and galaxies, the lack of star-forming/AGN hybrid galaxies, and the abundance of highly-obscured Compton-thick AGN. In so far as possible, flexibility was built into the simulations to allow post-processing to improve their accuracy as observations in the years ahead lead to improved constraints. Major advances in these areas are expected from the far-infrared surveys to be performed by the [*Herschel*]{} Space Observatory (Pilbratt 2008). To facilitate such comparisons we have post-processed the $S^{3}$–SEX simulation to cover these wavelengths. In this paper, we describe the recipes for assigning infrared spectral energy distributions (SEDs) to the radio sources, using existing mid- and far-infrared results from [*Spitzer*]{} and sub-mm survey data from [*SCUBA*]{} as the primary constraints. We then present our predictions for [*Herschel*]{} surveys, bolstered by a comparison with results from the Balloon-borne Large Aperture Submillimetre Telescope ([*BLAST*]{}) which offer a foretaste of [*Herschel*]{}’s capabilities. In keeping with the philosophy of the S$^{3}$ project to maximise the degree of interaction between the user and the database, the infrared fluxes are also provided on the $S^{3}$ webpage 