I have disabled all catalogues apart from the Nokia ones, I have deleted about 12 applications and I still have not got enough root space (about 38.4mb free). Either my device is abnormally chewing up root space (which may explain why it has been acting so totally crap last couple of days) or there has to be a more sensible allocation of root space by Nokia. Can't have to delete like 15 apps each time there is an update.