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tokens: KEKC thanks the Science and Technology Facilities Council of the United Kingdom (STFC) and JEG thanks the Royal Society for a University Research Fellowship. JSD acknowledges the support of the European Research Council via the award of an Advanced Grant, the support of the Royal Society via a Wolfson Research Merit Award, and both JSD and NB acknowledge the contribution of the EC FP7 SPACE project ASTRODEEP (Ref. No: 312725). AK acknowledges support by the Collaborative Research Council 956, subproject A1, funded by the Deutsche Forschungsgemeinschaft (DFG). We would like to thank Alexandra Pope for useful discussions regarding stacking of clustered populations and Martin Hardcastle for suggesting to perform the radio stack. This work is based on observations carried out with SCUBA-2 on the James Clerk Maxwell Telescope (JCMT). The JCMT is operated by the Joint Astronomy Centre on behalf of the STFC, the National Research Council of Canada, and (until 2013 March 31) the Netherlands Organisation for Scientific Research. Additional funds for the construction of SCUBA-2 were provided by the Canada Foundation for Innovation.