  In a long-term observing project we have imaged a complete sample of FRII
quasars and radio galaxies with z < 1.0 at high resolution and high sensitivity
with the VLA and MERLIN. This sample of 98 sources includes 15 quasars, 11
broad line radio galaxies and 57 narrow line radio galaxies, allowing
unification to be considered in terms of source morphological properties. Radio
maps of all the targets have been presented in earlier papers. Here we carry
out a systematic analysis of the properties of the jets, cores, lobes and
hotspots of objects in the sample. The majority of the tests that we perform
show that the data are consistent with a model in which quasars and broad-line
radio galaxies are unified with narrow-line objects. Relativistic beaming is
the main effect that determines the properties of kiloparsec-scale jets, and it
may also have some effect on hotspots. However, some properties of the sample
are difficult to account for in simple unified models.
