So this goes out to anyone who may be able to help. I literally just got a new Nokia Lumia 1020 from my network and as per usual as with all network only handsets they have branding and their own bloatware stuff on there which slows the handset down and often makes it slightly unstable. I know that with Android handsets it's a simple case of just installing a rooted version of your firmware and then replacing with the native unlocked/unbranded firmware which will debrand your handset, however I've never done such things with windows phones and certainly never messed about with a Nokia.
Any help from anyone who has achieved this would be great. The product number for mine is the RM-875.