Spelling Question

This is one thing I'm not really sure on, here in the UK, do we use "S" or "Z" in words like realised, or realized, organise, organize and so on.
Or do we use both in English?
Or do we use both in English?
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How about 'petrol'?so it's gasoline or gazoline, right?
Or which is the correct way to say; "A" are yous guys going out for a beer? or Ain't yous guys going out for a beer?
I think in the U.S. here the "z" is used more, as I look at this I recognize realize and organize more with a "z', but as Hagar said, either is considered correct.
Ah, clutching a little banner in the face of a hurricane?I realise I'm fighting a losing battle but someone has to maintain standards.
Or which is the correct way to say; "A" are yous guys going out for a beer? or Ain't yous guys going out for a beer?
Being an old-fashioned git I prefer realise, organise etc., spelt with an S as I was taught at school. 8-)
Being an old-fashioned git I prefer realise, organise etc., spelt with an S as I was taught at school. 8-)