Acknowledgements

This work has been carried out with support from the UK Engineering and Physical Sciences Research Council (EP/H049010/1). The authors would like to thank everyone who helped with the site works. This includes, but is not limited to, Arup Geotechnics and Tony Suckling of Balfour Beatty Ground Engineering for initial assistance, Roger Macklin and Gareth Powell at Geothermal International Ltd, Paul Turnbull and colleagues at Geo-Drill Ltd, and the staff of Foundation Developments Ltd. We are particularly grateful for the support of ISG, especially Malcolm Peart. We would like to acknowledge assistance with instrumentation installation and data logging from Joel Smethurst, James Rollinson and Harvey Skinner.