55 articles for website content - perfect English only

You are bidding to write 55 articles to form the contents of web pages. These will be the main pages for a UK website, so perfect English is absolutely essential. I will pay up to $4 per article. Do not bid if your writing is not as a UK native. The pages are about car insurance and a few related subjects. You will need to do whatever research necessary, but there are only about 8 separate subjects, so many articles will be variations of the same themes. Articles must be minimum 800 words, perfect conversational UK English, no errors in grammar, spelling or punctuation. Each one to be totally unique, and will be tested against Copyscape and similar. No repetition of phrases or sentences, even when covering identical subjects. You must find suitable angles for each article and the content must be informative and useful, not just waffle. You will be given a keyword for each article, and this must be used to give a keyword density that I will specify. I will transfer a milestone payment and pay for 10 articles at a time when they are completed to a satisfactory standard. I would prefer this to take no longer than two weeks. Confirm how long you need to write them. Please provide several samples of your work as I want to see your writing style before making a decision. I will not consider you at all if you cannot provide samples. Once paid for, all rights to the articles will be transferred to myself, so you may not resell, reuse, rewrite, give away or publish the articles anywhere else. Plenty more similar work in future, so looking for long term reliable people to work with.