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Originally posted by K_OS
When I am wrong I admit it and I found out that I was wrong...
Deepwaters pointed out to me that sometimes British substitute s for z, just as they add u in certain words...ie colour
I think you will find that these words have been used in the english language a long time before the US was colonised (colonized), there for please dont think it is the British who "substitute" letters but the americans who change the language.