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I've held a number of licences (for licenced premises) and the one thing you don't do is show some logic - this was the legal advice we were (repeatedly) given.
i.e. if you refused service you stuck with "I am refusing service", as the moment you gave any reason you opened yourself up to accusations of prejudice etc.
If you stuck to "I am refusing service, as is my right" then that's you proof against anything - even if you are a renowned pineapplist.
I guess in practice you'd have to show some sort of logic to the decision, so couldn't apply rules arbitrarily. I'd always assumed it was absolutely at their discretion, but thinking about it there must be some sort of intersection with equal rights laws at some point (as per the Christian bakery gay cake episode). Otherwise a property owner could just ban headgear and effectively bar access to a huge chunk of religious folk, for example. Whereas banks can ban full-face motorbike helmets as the reason is clear and fair.
Any lawyers on here?