In reply to stevetaylor20:
Furthermore to the help you've all been. I've spoken to three different companies and they refuse to fit boots, that I already have, due to 'legal' reasons. I don't know if i'm going to end up keeping these boots or getting rid of them but obviously, logic would suggest i'd try to keep them if they do fit and buy other if i have to. I'd previously been the many shops and all of them didn't know jack about the boots, so I ended up doing the best I could.
Bit of info for you. This whole thing is becoming a joke. I spoke with sportiva and they said despite the fact that my boots say 12UK and the box 12.5, they are 12. They said it can happen that the box sizes have mistakes on. I also spoke with two other companies, they checked their stock and it seems much of their stock show different sizes from the boot to the box!!!! - To their surprise!
Also, I have tried on a UK12 in two different shops around London, both of them feel a lot smaller than the 12 I have, leading me to actually believe they really are a 12.5 and not a 12. I know i'm supposed to go by 47, but still!