hi, I was also 615B user, mine still working great. I moved for the 625xt because of the longer lasting battery and HR belt. And like you, I could not find these anywhere in Europe (I am from Czech republic). After reading few threads here on forum I found that you can try Expansys to get brand GH625XT (although, browsing web I found not good recomendation for this reseler). I was than told here that I can try Arival SpoQ watch, which can be ordered in Europe and is the same as 625XT. Probably different brand for Europe... I dont know. What I know is that after buying these, they are totaly the same, you can load GH firmware, manuals in the box are word to word the same like those you can download on GlobalSat webpages. I bought mine via Cyberport Germany cause I could visit one of their store and buy it there. You can order to Britain, perhaps you can find Arival watch reseller in Britain directly. If you dont mind the other logo.