Someone said :
The Indo had an article on it before and its legal.
Disadvadvatage is you'll have to pay for the meds when you go to the pharmacy to use the prescription.
I wouldn't use this service myself due to historic influences on my health etc but my GP is now E75 per visit - a pretty epic GP so I'm very much willing (an thankfully able) to pay it.
I'd assume I'd be paying for my meds, as to prepay before hand seems unusual, as there is no way to assume outcomes or prescriptions etc. a positive service if approached appropriately