tokens: The authors thank the referee for the many useful comments and suggestions which helped to improve this work. The WASP project is currently funded and operated by Warwick University and Keele University, and was originally set up by Queen’s University Belfast, the Universities of Keele, St. Andrews and Leicester, the Open University, the Isaac Newton Group, the Instituto de Astrofisica de Canarias, the South African Astronomical Observatory and by STFC. This work has made use of the Vizier database, operated at CDS, Strasbourg, France, the cross-match service provided by CDS, Strasbourg, and M. Skarka’s BlaSGalF online list of Blazhko effect stars ( http://www.physics.muni.cz/~blasgalf/ ).
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