Haere mai, lexxzi, kei te pehea koe? It's so nice to have someone else from the non-penal side of the Tasman here, I'm even prepared to magnanimously forgive you for being a citizen of Banksville. As to your inquiry, MerriamWebster, a USn dictionary I believe, lists enquiry as a mere variant of inquire. Chambers says at enquire, "See inquire." It seems that our word comes from Old French enquerre which in turn comes from Latin inquirere, so perhaps the alternate spellings a result of the sort of duplicate importation that gave us royal and regal. Or perhaps, I am simply a gibbering loon from the unknown wilderness south of the Bombays.
Noho ora mai, ka kite.