3C 123, 196, 247, , 295 and 336 have been mapped with the Cambridge One-Mile telescope at a frequency of 5 GHz, with a resolution of 6 arc sec. The maps provide new positional information and physical data for the six sources. 3C 123, 247 and 336 are resolved into double sources, and an identification of 3C 247 with a galaxy is suggested. A comparison of the structural information derived from the 5 GHz work with previous observations using long baseline interferometers, and with observations of interplanetary scintillation, is made. Morphologically the quasi-stellar source 3C 336 is shown to be similar to 3C 47, and this is interpreted as further evidence for continuing or recurring activity in quasi-stellar sources over periods of at least io6 years.