OED prefers 'z'
"btw - I hate seeing z's in there"
Actually 'z' is the prefered letter according to the OED. It ws even used to solve an Inspector Morse case where the murdered English prof would never have used an 's' because they would know to use 'z' so you can't get much more British than that! It only became the fashion to use 's' in the latter half of the 20th century. So you can't really blame the Americans for that.


