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tokens: Acknowledgements MR and CD acknowledge funding from the European Research Council Starting Consolidator Grant (no. 307209). CD acknowledges support from an STFC Consolidated Grant (ST/L000768/1). We thank Anthony Challinor for helpful discussions and comments on a draft of the paper. We also thank Martin Bucher for useful discussions in the early stages of this work. We acknowledge the use of the psm package (Delabrouille et al. 2013 ), developed by the Planck working group on component separation, for making the simulations used in this work. Some of the results in this paper have been derived using the healpix package (Górski et al. 2005 ).