If you need to fetch a single blog articles from your wordpress site to show them in another web application then you can use the new JSON API in wordpress to do this.

$wp_url = "https://secure.brightonhealthandwellbeingcentre.co.uk/wp-json/wp/v2/posts/$wppostid?_embed";
$wp_json = file_get_contents($wp_url);
$wppost = json_decode($wp_json, TRUE);

You can replace $wppostid with the real postid for the post.

If you need to fetch a list of article from a wordpress category then see this article for more instructions.