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tokens: We wish to thank the anonymous referee for carefully reading our manuscript and making a number of very useful comments. We wish to thank Eric Gérard, and Laurence Alsac and other Nançay Radio Telescope staff members for their technical advice and assistance. TJ and RM are grateful for the bursary provided by the South African SKA Project Office; S.B., T.J., R.C.K.K., M.R. and PS were supported by the South African National Research Foundation. The Nançay Radio Astronomy Station is operated as part of the Paris Observatory, in association with the Centre National de la Recherche Scientifique (CNRS) and partially supported by the Région Centre in France. This research has made use of the HyperLeda database ( http://leda.univ-lyon1.fr ), the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration and the Sloan Digital Sky Survey which is managed by the Astrophysical Research Consortium for the Participating Institutions.