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tokens: Acknowledgments The authors are grateful to Ray Sharples for the use of KMOS GTO time for some observations and for useful discussions regarding instrumentation; our thanks also to Renske Smit and Helen Johnson for obtaining additional observations of NGC1407 and NGC3379 for this project. We wish to thank Charlie Conroy for providing up-to-date versions of the CvD models and the anonymous referee for helpful comments that improved the paper. PA was supported by an STFC studentship (ST/K501979/1) and RJS by the STFC Durham Astronomy Consolidated Grant 20142017 (ST/L00075X/1). This work is based on observations obtained at the Very Large Telescope of the European Southern Observatory (programme IDs: 093.B-0693 and 094.B-0061). The data used here are available through the ESO science archive (programme IDs: 093.B-0693(A), 094.B-0061(C)).