Spelling 

Hi Richard. Great to see you helping to correct spelling mistakes. However, you should be aware of Wikipedia:Manual of Style#National varieties of English. "An article on a topic that has strong ties to a particular English-speaking nation should use the English of that nation." This includes differences in spelling between US English and other varieties of English (i.e. US "center" Brit. "centre", US "organization" Brit. "organisation" etc.) A comprehensive list of differences can be found at American and British English spelling differences, Note that Australian and New Zealand articles largely follow British English spelling too. Cheers,