Cheers Guys. Will see if I can book a physio before flying out Friday
One other thing to bear in mind - if you half mara is only two weeks away, no training/running you do between now and then will make you run any better and resting may well clear up the issue, so although I know it's psychologically difficult, if you don't run between now and then it won't affect your performance at all. Depending on any physio advice, I'd rest up, and maybe just do a couple of miles a day or two before to loosen up and check it out. Good luck.....