10% of people in the UK use homeopathy – an estimated 6 million people.
In Britain, the market for homeopathy is growing at around 20% per year. In 2007, it was estimated to be worth £38m, and is projected to reach £46m in 2012.
There are ~ 400 doctors in the UK that use homeopathy, regulated by the Faculty of Homeopathy and promoted by the British Homeopathic Association.
There are ~1,500 professional homeopaths (non-medically qualified homeopaths) in the UK, regulated by the Society of Homeopaths (65%), Alliance of Registered Homeopaths and Homeopathic Medical Association. They largely operate in private practice outside the NHS.
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See the NHS spending in the UK.