Principal is either a noun or an adjective, but both uses have very similar meaning. Principle is simply a noun. Below is an extract from an excellent local government website promoting sustainable development:
Principal (noun): the most important person in an organisation.
Principal (adjective): the first in importance, rank, value, etc.
Principle (noun): a standard or a rule.
Cambridge City Council should have written:
It is nevertheless a good thing that local councils have such principles: GCSE.com believes sustainable development to be very important too.
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