Satoshi is a mystery person or individual and we can only know who he was if he discloses himself or Theymos show us his PM which could give us a tip of who he was and theymos once said he had no plan to disclose his PM as a sign of respecting his privacy which what the crypto community cherishes the most.
But using his mode of writing in British English to judge where is based will provide false answers cause he may have studied in British, know British English, or borne there and later relocated.