I don't know if there are any vendors in the UK that have the KR808D, but you might give that a try! I have the VaporKing from V4L and let me tell you, that really turned things around for me as far as ecigs go. It is very easy and the customer service from V4L is unbelievable! It is a US vendor however. I have ordered some things from Health Cabin which is directly from China, and they have always arrived here to me in the US within a week of ordering so that might be an option for you.
KR808D's are 2 piece units - a battery and a cartomizor (cart and atomizor built in together) The cartomoizors are very easy to refill, and the extra long batteries last about 6 hours. There are some very good refilling videos on the V4L forum that will give you an idea on how to refill etc... and you can also see what people are saying about the KR808D. I happen to think that V4L is the best vendor out there, but there are other vendors out there that carry it. Vapor4Life - e-cigarette-forum.com • The place for electronic cigarette reviews, news and chat
Hang in there, you just need to find what will work for you! Good luck to you!