tokens: ACKNOWLEDGEMENTS We are grateful to the referee Anita Cochran whose comments improved the quality and clarity of this manuscript. The WHT is operated on the island of La Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. We gratefully thank the staff at the Isaac Newton Group for their support in the observations reported here. MGH acknowledges receipt of a Northern Ireland DEL studentship award. AF acknowledges support for this work from UK STFC grants ST/L000709/1 and ST/P0003094/1. CS acknowledges support from the STFC in the form of the Ernest Rutherford Fellowship.
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