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tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for helpful comments that improved this paper. We gratefully acknowledge support from the Science and Technology Facilities Council (HPE through grant ST/K501979/1, SR through ST/N50404X/1, TPR through ST/P000541/1). HPE acknowledges support under NASA contract NNG08FD60C. This research made use of data obtained from the 3XMM XMM–Newton Serendipitous Source Catalogue, based on archival observations with XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. We also acknowledge the use of public data obtained from the Chandra Data Archive and the Swift Data Archive.