MBT's own website warns against buying online:
"If you have seen a website, it is possible they may not be one of our recommended stockists and to make sure, we would advise you to check our stockists list online or get in touch with our customer services department.
If you do purchase from these sites, please note that you may run the risk of purchasing a sub standard counterfeit pair of shoes. We have also had reports from consumers that have purchased via these websites and then not received any goods at all"
Further, they state that MBTs must be fitted by a trained specialist, with a fitting requiring at least 10 minutes to be done properly. There's no way that you could get that done online.
http://uk.mbt.com/Header/Help/FAQ.aspx
You can find your nearest stockist here:
http://uk.mbt.com/Home/Stores.aspx
Chris