"Scientists have devised a technique called the Randomised Controlled Trial, which corrects for errors in thinking, placebo effects and other biases.As he explains on his blog, Skepticopathy then turned this into a flyer in the size and style of Boots' own, and slipped them into the plastic holders on the homeopathy shelves.
Through these trials, scientists have been able to reliably demonstrate that, when all sources of error are removed, homeopathy does not work.
Boots know this, but will take your money anyway. If you rely upon homeopathic treatment you may not get better, but at least Boots will profit from your purchases."
You can find out more on his blog, where he's even made the flyer available to download (not that you'd want to get any mischief like that, of course).