Here is someone else who used that therapy.
www.quackwatch.com/01QuackeryRelatedTopics/Cancer/davidson.html.
According to Quackwatch
"There is no scientific evidence exposure to magnetic fields is effective against cancer, that cancer cells respond differently than normal cells to a magnetic field, or that the magnetic field produced by the clinic's device can cause any cell to implode.
The magnetic resonance imaging (MRI) devices used for medical diagnosis use radiofrequency waves, a very strong magnetic field, and a computer to produce cross-sectional images of the body. The patient is placed inside a large magnetic coil. When the magnetic field is turned on, it causes hydrogen nuclei (protons) within the body to line up in one direction. Then selected radiofrequency waves flip these particles in another direction. When the waves are turned off, the particles realign, releasing an electromagnetic signal that the computer translates into an image. The procedure produces no known permanent effect on cell structure or function. It may show the presence of a cancer by producing shadows that represent tumor masses. But it cannot detect any difference between normal and cancer cells at the cellular level.
If magnetic fields were capable of killing cells, MRI devices might seriously damage the patient's body. Furthermore, even if powerful magnetic fields could kill cancer cells, there is no reason to believe that the clinic's device—which had a much weaker magnetic field—could have had the same ability."
There is such a drive to find a cure for cancer that I really think that if this therapy had a chance of true success, it would have been picked up eagerly by one of the many genuine researchers.
Should the NHS charge for such things?

Can't get the journalists these days!