Top: redshift distribution of the FR-type sources in our sample shown in grey. The Gaussian distributions show Gaussian fits to the redshift distribution of different populations, colour-coded based on radio classification: FRIIs (red), FRIs (blue), and FRI/FRII (green). We also show the COM AGN control sample as a black solid line. Bottom: radio luminosity at 3 GHz vs. redshift for the FRIIs (red), FRIs (blue), FRI/FRII (green), and COM AGN (black) in our sample. The large triangles give the corresponding mean values for each population and the standard deviation. Squares are objects without radio excess.