tokens: This work is partially supported by programmes number HST/GO 11700, 12587, 12905 and 13767 from NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc, under NASA contract NAS5-26555. JSBW acknowledges the support of an Australian Research Council Laureate Fellowship. MT acknowledges the support of an Australia Research Council Future Fellowship. We would like to acknowledge the anonymous referee for their helpful comments, Sharon Rapoport for her initial lens modelling of the system and Stephanie Bernard for her help with the BoRG data.
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