gb is missing for get_cc_model (no imports in __init__)

[EmberCraze]

Using get_cc_model does not work for GB because the __init__.py file is missing imports to the relevant modules as business_tin or vat or personal_tin.

Which number is defined as which? I would like make a PR with is change.

[arthurdejong]

I'm sorry but I don't know which formats are used for exactly what (other than what is already described in the documentation). The VAT number is most likely generally assigned to businesses only while the UTR seems to be assigned to both individuals and organisations. I'm unsure if any one of them are general-purpose unique identifiers beyond the scope of the relevant tax. Some countries seem to have a single identifier that is used across government services (and sometimes beyond) while other countries have an identifier per government agency.