High-resolution observations of a complete sample of 27 FR II radio galaxies and quasars with 0.3 < z < 0.6

We present high-resolution Very Large Array and Multi-Element Radio Linked Interferometer Network observations of the 27 FR II radio galaxies and quasars with 0.3 < z < 0.6 from the sample of Laing, Riley & Longair (1983). The jet detection rate is similar to that found in the lower-power, lower-redshift studies carried out using similar observing conditions. A wide range of lobe and hotspot structures is observed in both the radio galaxies and quasars in the sample. Interestingly, a high proportion of the quasars exhibit structures and asymmetries markedly different from those of the radio galaxies; this is difficult to explain using arguments based upon projection effects alone.