030 Number Ranges for example 0300 and 0303 Numbers, are only permitted for use by public sector bodies and not-for-profit bodies e.g. registered charities. If Ofcom's criteria is not met, then 0333, 0330, 034 or 037 numbers must be used.
The Criteria for eligible bodiesOfcom’s regulation states that the bodies eligible to use 030 Numbers should meet at least one of these two basic criterias:
Follow the link for Ofcom's Web site which has a useful document for Guidance on bodies eligible to use 030 Telephone Numbers. The document will be updated so that continuous guidance on how individual bodies will be considered as eligible to use 030 Numbers is available.