  In previous papers we have discussed high-resolution observations of a large
sample of powerful radio galaxies with z<0.3. Jets are detected in up to 80 per
cent of the sample, and radio cores in nearly all the objects; in addition, we
are able to resolve the hot spots in most sources. In this paper we present
measurements of the radio properties of these components.
  The prominences of the jets detected do not appear to be a function of radio
luminosity, providing the clearest evidence yet that the reported low detection
rate of jets in radio galaxies has been an artefact of low-sensitivity
observations. We find a positive correlation between the total source length
and core prominence in the narrow-line radio galaxies. We have found evidence
for a relationship between hot spot size and total source size, but few other
significant relationships between hot spot properties and those of the jets or
lobes. We compare our measurements to those of Bridle et al (1994), based on
observations of a sample of quasars, and argue that the results are consistent
with a modification of the unified model in which the broad-line radio galaxies
are the low-luminosity counterparts of quasars, although the situation is
complicated by contamination with low-excitation radio galaxies which appear to
have radio properties different from the high-excitation objects. We discuss
the classes of empirical model that can be fitted to the dataset.
