  (Abridged) We present a photometric investigation of the variation in galaxy
colour with environment in 11 X-ray luminous clusters at 0.07<z<0.16 taken from
the Las Campanas/AAT Rich Cluster Survey. We study the properties of the galaxy
populations in individual clusters and take advantage of the homogeneity of the
sample to combine the clusters together to investigate weaker trends in the
composite sample. We find that modal colours of galaxies lying on the
colour-magnitude relation in the clusters become bluer by d(B-R)/dr_p=-0.022
\pm 0.004 from the cluster core out to a projected radius of r_p=6 Mpc; further
out in radius than any previous study.....
