  Foreground radio sources are a major contaminant for centimetre-wave cosmic
microwave background (CMB) measurements and the 9C survey was set up as part of
the observing strategy of the CMB telescope, the Very Small Array. Prior to
this survey with the Ryle Telescope at 15 GHz there was no comparable
high-frequency radio survey of any extent. Our first published source count
reached a limit of ~25mJy but we have now surveyed some areas more deeply, to a
completenesss limit of ~5mJy. We present the results from this deeper survey.
