Comparison of the UV luminosities of the sources in our sample (red circles), the extended radio sources in the sample of Aditya (2019) (blue triangles), and the extended sources in Maccagni et al. (2017) (blue squares: detections; blue crosses: non-detections). The dashed horizontal line marks the threshold UV luminosity L_UV = 10²³ W Hz⁻¹, above which it has been argued that the radiation from the AGN ionises the H I in and around its host galaxy.