This is always a difficult one; I would go with Keeley's suggestion, take copies & try a combination of hand-delivering one (if they accept hand-delivery), normal post & special delivery. I wouldn't suggest recorded delivery because that service only gets a signature on delivery, it doesn't actually guarantee delivery, whereas special delivery does. Keep a copy for yourself & it wouldn't hurt to hand a copy into your GP. All bases covered then! It may seem a little over the top but we all keeo reading about such terrible delays because of things getting 'lost'....good luck xxx