RewriteEngine on

RewriteCond %{HTTP_HOST} ^mydomain\.co\.uk
RewriteRule ^(.*)$ http://www.mydomain.co.uk/$1 [R=301,L] 

RewriteRule ^$ /index.php [L]
RewriteCond $1 !^(index\.php|robots\.txt|favicon\.ico|images|uploads|styles|scripts|siteadmin|fckeditor)
RewriteRule ^(.*)$ /index.php/$1 [L]

#this stops screen flicker in IE
BrowserMatch "MSIE" brokenvary=1
BrowserMatch "Mozilla/4.[0-9]{2}" brokenvary=1
BrowserMatch "Opera" !brokenvary
SetEnvIf brokenvary 1 force-no-vary

#this stops screen flicker even when IE is set to check
#for new versions on every visit to the page
#requires Apache module mod_expires
#(LoadModule expires_module modules/mod_expires.so)
ExpiresActive On
# comment out default so we only add expires header for relevant files
# leave default caching to browsers - AY 13-05-2005
# 3 hours
# ExpiresDefault A10800
# shorten from 5 days after access (A43200) to 1 hour - 5 days seemed a bit excessive! AY 13-05-2005
ExpiresByType image/gif A3600
ExpiresByType image/jpeg A3600
ExpiresByType image/png A3600

#ErrorDocument 404 /404