This rewrite rule has worked for me well on several sites:-

Options +FollowSymLinks
RewriteCond %{HTTP_HOST} ^catering-and-industrial-temperature-supplies.co.uk [NC]
RewriteRule ^(.*)$ http://www.catering-and-industrial-temperature-supplies.co.uk/$1 [R=301,L]

Unfortunately on http://www.catering-and-industrial-t...supplies.co.uk it stops the categories working,that is, when you click on a category it does not take you to the products.

Would anybody know why that is please ?????

Thanks/ Paul