As a BrE speaker, I do use "ise", but "ize" is not unknown, especially in science (I believe that the British published journal Nature has it as their house sty

As a BrE speaker, I do use "ise", but "ize" is not unknown, especially in science (I believe that the British published journal Nature has it as their house style). Recently I think it has been declining as it has been identified as "the american version".