All fair enough - your argument, Robin, of course - but it does seem to me to be a case of "we believe we have possible prima facie evidence - anonymously EM'd to us - that makes it potentially possible that you have not been acting as we believe a good doctor should. Hence off with your medical head until we found reasons to put it back".
For which reason, to my way of thinking, that indeed is not much informed with knowledge of British law or the GMC (I am a civilzed European, after all ;) they should have given nominally rational reasons, at the very least. Which, since they didn't do it, seems also something they deliberately left undone.
1. You must not prescribe any prescription only medication, as detailed in the British National Formulary;
I read it as: "You are not allowed to write out recipes for such medicine as are in England only available by a recipe from a medical doctor" i.e. she is not allowed to practice the next one and a half year as a medical doctor.
I hope to be undeceived, though, and is on the statement I read a rationally totally unmotivated decision, that sounds to me highly doubtful in law, but then the costs and trouble of appealing may be enormous, as they well may know.