A lot of people in the UK, and indeed in other parts of the world, will tell you that ‘z’ spellings (usually verbs, e.g., realize, organize and summarize) are American English and examples of Americanisation (Americanization!). They maintain that ‘realise’, ‘organise’ and ‘summarise’ are the correct way to spell those verbs in British English. These days, ‘-ise’ spellings are more common in British English texts but you can actually use either ‘s’ or ‘z’ spellings, as long as