Someone

<phych0>     RewriteCond %{HTTP_HOST} [^.]+\.darktech\.org\.uk$
<phych0>     RewriteRule ^(.+) %{HTTP_HOST}$1 [C]
<phych0>     RewriteRule ([^.]+\.darktech\.org\.uk)(.*) /var/www/users/wwwdarktech/vhosts/$1$2
<phych0> thats what im using.
<phycho> <phych0>     RewriteCond %{HTTP_HOST} [^.]+\.darktech\.org\.uk$
<phycho> <phych0>     RewriteRule ^(.+) %{HTTP_HOST}$1 [C]
<phycho> <phych0>     RewriteRule ([^.]+\.darktech\.org\.uk)(.*) /var/www/users/wwwdarktech/vhosts/$1$2
<phycho> not sure if that will be any use to you
<phycho> thats what i use