I don't think there's a UK stockist any more. Infamous JT used to stock it, but that was prior to the new edition. This has put me off ordering it for the time being, as postage (& customs charges if ordering miniatures) will make it pretty expensive. It might be worth emailing Metal King to enquire whether Sean is looking into getting UK & European distribution again, as I've been meaning to do.
SeanKSutter@gmail.com
P.S. I've just emailed him so you don't have to - though I suppose he may give it more consideration if more potential overseas customers show an interest.