DM Redirecting the HTTP not HTTPS

Hi, one of the sites I have setup http://www.polborder.co.uk/ has an SSL which I installed with Lets Encrypt (https://www.ssllabs.com/ssltest/analyze.html?d=www.polborder.co.uk) however when I view the site the blog URL is still http:// I have set the DM to be https:// I have read a number of blog posts about it but an still no closer to finding the issues. If you can take a look that would be ideal.