Redirecting from No www to www
You must make sure to have your domain redirect to ‘www.’ even if it is typed without that part. If not, it will appear as though you have a site at “www.<yourdomain>.com”, as well as at “<yourdomain>.com”, and you will incur a duplicate content penalty from search engines. In addition, it also makes your website appear nice and clean and loads off www.<yourdomain>.com.
Add this snippet to your .htaccess file. Make sure to fill in your actual domain where it says “jolt.co.uk” in lines 2 and 3:
RewriteEngine on RewriteCond %{HTTP_HOST} !^www.jolt.co.uk$ RewriteRule ^(.*)$ http://www.jolt.co.uk/$1 [R=301]