1. Log in to your WordPress Dashboard
  2. Click Settings > General
  3. Update WordPress Address (URL) and Site Address (URL) from http://www.yourdomain.co.uk to https://www.yourdomain.co.uk
  4. Click Save Changes
  5. Add the following code to the top of your .htaccess file
    <IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{SERVER_PORT} 80
    RewriteRule ^(.*)$ https://www.yourdomain.co.uk/$1 [R=301,L]
    </IfModule>