Yes, the British use the suffixes -ise and we, U.S. English use -ize. Webster popularized spelling differences in the states partly for nationalization and the -ise is in British English leftover from the Norman conquest, IIRC, when the court and aristocracy spoke French. I’m a geek for word etymology. There’s a great podcast called History of the English Language, but you have to really be interested because it starts at the very beginning and I think it has over 60 episodes. The History Channel did a several part series on the subject a few years ago. I loved it.
I apologise for the digression. 😉 I’ve watched the doc, but haven’t listened to the whole podcast yet, so I will comment on that later. I was listening but my husband started watched a Trump press conference and I don’t have my earbuds, sadly.