If a word has a Greek root the suffix is -ize from the Greek izo, as in apologize. If the word has a Latin/French origin the suffix is -ise in keeping with the Latin/French style, for example colonise.
The word lieutenant is pronounced left-tenant out of tradition but admittedly the yank pronunciation of loo-tenant is both more sensible and closer to the French origin.
It is aluminum, not aluminium. Chemist Sir Humphrey Davy earned the right to name it and he choose aluminum. Later on another man, who was not a chemist and did not earn the right to name it, claimed that aluminium sounded "more classical" and everyone agreed apparently. Canada and the USA use Sir Davy's original and proper name
It's coloUr, harboUr, favoUr, etc. and centre, theatre, etc. Either overhaul the language or don't, there is no sense in arbitrarily making changes to just one or 2 letters in a few words. Few languages are always phonetically perfect, get over it.
If the prison is older it's gaol, if newer it's a jail.
In the case of regional differences like tyre/tire, fringe/bangs, pants/trousers, it's irrelevant and no one is correct or incorrect