  We present the results of a programme of thermal-IR imaging of nineteen z~1
radio galaxies from the 3CR and 3CRR samples. We detect emission at L' (3.8um)
from four objects; in each case the emission is unresolved at 1" resolution.
Fifteen radio galaxies remain undetected to sensitive limits of L'~15.5. Using
these data in tandem with archived HST data and near-IR spectroscopy we show
that 3 of the detected `radio galaxies' (3C22, 3C41, and 3C65) harbour quasars
reddened by Av<5. Correcting for this reddening 3C22 and 3C41 are very similar
to coeval 3C quasars, whilst 3C65 seems unusually underluminous. The fourth
radio galaxy detection (3C265) is a more highly obscured (Av~15) but otherwise
typical quasar which previously has been evident only in scattered light. We
determine the fraction of dust-reddened quasars at z~1 to be 28(+25)(-13)% at
90% confidence. On the assumption that the undetected radio galaxies harbour
quasars similar to those in 3C22, 3C41 and 3C265 (as seems reasonable given
their similar narrow emission line luminosities) we deduce extinctions of Av>15
towards their nuclei. The contributions of reddened quasar nuclei to the total
K-band light ranges from ~0 per cent for the non-detections, through ~10 per
cent for 3C265 to ~80 per cent for 3C22 and 3C41. Correcting for these effects
does not remove the previously reported differences between the K magnitudes of
3C and 6C radio galaxies, so contamination by reddened quasar nuclei is not a
serious problem for drawing cosmological conclusions from the K-z relation for
radio galaxies. We discuss these results in the context of the `receding torus'
model which predicts a small fraction of lightly-reddened quasars in samples of
high radio luminosity sources. We also examine the likely future importance of
thermal-IR imaging in the study of distant powerful radio sources.
