Bonominator said..
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Actually use of the "s" is correct UK and Australian English. Use of "z" is American English, so sorry Macro. Baa bum. But you know, that's not half as funny as a woman holding a placard quite happy to call our PM a c u n t in public.
You made me look it up. It's the other way around. "Z" for British "s" for US.
