Write weekly blog article on health issues

We are the new health radio station for the UK and Europe, has a blog for which we need fresh articles/blog entries every week.
We will need these submitted by Friday evening every week complete with list of seo labels/keywords used.
The writer will normally have the freedom to choose the topic but may be asked to work on a particular topic from time to time.
The blog entry/article will also be read out and broadcast on-air during the following week.

If the selected copywriter would also Tweet about their blog during the week following publication, that would be helpful.