Since some CML patients live a long time, testing for survival would be difficult.

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Operators know that rapidly converging the processes of policy control and real-time charging is critical for their long-term survival.

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That has led, over a long period of time, to far better cure and survival rates for cancer, for heart disease, than we have in Britain and ultimately we have to not worry so much about the system as do we actually give people in Britain the health care we deserve, and that's what I want to see.

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In a tougher measure of efficacy that takes into account how long patients lived, called progression-free survival, Thalomid more than doubled the length of time patients lived, to 57 weeks.

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"I also remember that I lent him a book on SAS survival... it had things like how to survive in the outdoors for long periods of time, " he said.

BBC: April Jones in the leisure centre