Thank you for your advice. I dropped the FNC FM Radio apk into the Swedish Snow ROM zip as you suggested and re-flashed (after wiping everything as per original instructions), but the FNC FM Radio also force closes the moment it is started.
As you suspected, it is something deeper. Given that the FM Radio works on the Crescent with FNC RLS7, is there anything else I could do, bearing in mind I am not a developer and that I only have access to a Windows 7 PC? Failing that, would you be able to investigate further please?
I'm not too sure then I'm afraid. I am very limited experience in Android development so I'm pretty much on par with you so I can't help! I'm also getting a new phone next week so I can't see this ROM being updated (Unless somebody wants to take over then that would be perfectly fine and I would encourage somebody to take over this for me).