Andrew Holmes-Siedle is a physicist and consultant to Brunel University of West London, collaborating on CERN research and developing silicon devices. He previously spent over ten years working in Princeton (USA) on space and defence programmes and owns REM Oxford Ltd.. Len Adams is a consultant to Spur Electron, advising the British National Space Centre and other agencies. He is also an Associate Professor at Brunel University of West London. He recently retired from the European Space Agency in The Netherlands, where his group handled most of the radiation problems for the Agency.