  The TexOx Cluster (TOC) Survey uses overdensities of radiosources in the NVSS
to trace clusters of galaxies. The links between radiosources and rich
environments make this a powerful way to find clusters which may potentially be
overlooked by other selection techniques. By including constraints from optical
surveys, TOC is an extremely efficient way to find clusters at high redshift.
One such field, TOC J0233.3+3021, contains at least one galaxy cluster (at z ~
1.4) and has been detected using the Sunyaev-Zel'dovich (SZ) effect. Even in
targetted deep optical observations, however, distinguishing the cluster
galaxies from the background is difficult, especially given the tendency of TOC
to select fields containing multiple structures at different redshifts.
