Les40 & others - Please remember that you can email me at theSpringQuiz@btconnect.com with any queries if you don't want to make them public.
I understand your hesitancy about 100, but I believe it is a de facto placename even if it is not strictly the name of a city, town or village. Its Wikipedia entry refers to it as "an area in...", so to my mind that makes it a placename.
I hope you are enjoying the quiz.