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I've gone with this .htaccess from your soulgorithm.com: Options +FollowSymlinks RewriteEngine on RewriteBase / RewriteCond %{HTTP_HOST} ^www.domain.co.uk [NC] RewriteRule (.*) http://domain.co.uk/$1 [L,R=301] RewriteCond %{REQUEST_URI} (.)/$ RewriteCond %{REQUEST_FILENAME}.php -f RewriteRule (.)/$ $1.php [L] RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}.php -f RewriteRule .* %{REQUEST_FILENAME}/ [R=301,L] and I'm now getting the results I'm after. I'm getting similar behaviour to you in Firefox and IE, which explains a lot. I really appreciate the length you've gone to to help me here, so big thank you!