Copywriter needed for article and landing page content creation

I need to find an experienced English language (UK) copywriter that can produce articles as well as wording for landing pages across a variety of different industries and topics. We are an SEO agency so we would need someone to be able to work with us closely and create content with SEO optimisation in mind. We would be looking for someone to do at least 5 articles of work per month but this is likely to increase.