A lot of articles needed - British English

I need a large number of articles written over the next year, mainly all in the health arena. The articles do *not* need to be written as pure medical articles. They are general interest articles within the health field. Because the articles will be going onto British websites, I'm looking for someone who can write in perfect British English (what other kind is there? :) I will pay *up to* $0.40 per 100 words and expect the normal length of an article to be between 300 and 600 words. I don't want to have to edit any of the articles, so if you can't write well please don't waste your own time and mine. On payment I will own all copyright to the article which means you cannot reuse it in any way whatsoever. Naturally, I expect the articles to pass Copyscape and plagiarism testing. If there's any scraped content, or I find spelling and grammatical errors you can have the article back and I'm not paying for it. This first project will be for 20 articles and I will consider only bids up to a maximum $40. I do need to see at least one sample of your work, simply to weed out the obvious time wasters.