We present optical spectra for a complete sample of radio galaxies and quasars comprising all sources from the Wall & Peacock 2.7-GHz sample with redshifts z < 0.7 and declinations δ < + 10°; this sample is complete down to a flux density of 2 Jy. Although not all of the 2-Jy sources have spectroscopic redshifts, we argue that most of the unidentified objects are at high redshifts and that our z < 0.7 sample is largely complete. The optical data will be analysed in a future paper.
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Tadhunter et al. (1993) studied this question.