  Some recent work on radio source fields at z~0.7 and z~4 is discussed. At
z~0.7 we find that radio-loud quasars are typically found in moderately rich
environments independent of radio luminosity, consistent with previous results
at z~0.5. In the field of the z=4.41 radio galaxy 6C0140+326 we find several
candidate z>4 galaxies using the Lyman-break technique, two of which have
detectable UV absorption features. In two z>4 radio galaxies, we find evidence
for gravitational lensing affecting the fluxes by a few tens of percent,
although we cannot rule out unusual lensing events which have larger
magnifications associated with them. A simple calculation suggests lensing of
z>4 radio sources should be very common.
