Shaun', if you type Gamma into the search box at the top of any page, you'll see some reported results. As I recall, a couple of people reported having success with it. In the US, it is very expensive, $600 or so every month. Maybe with your NHS it's not so steep. (As I recall, it was far less effective, or plain ineffective, for people with chronic CH. I have also never understood what the appeal would be except for (1) people for whom oxygen doesn't work, since the abort time in the trials was longer than what most/many people can get with an optimized O2 system; and (2) for its portability, which is not an insignificant benefit if it works and the cost isn't prohibitive.) I guess some people have been told that regular use has preventive benefits, and not just abortive. I don't remember if we found out how that worked out.