You can post with PHP using cURL or doing it yourself manually.
Search the archives for this, as the previous answers to this are
more complete than what I have time to explain now. Here is a quick
example of the manual approach:
http://shiflett.org/tutorials/php_post.txt
Thanks Chris. A useful answer that's much appreciated :)
And yeh, after just after posting I realised my example using Google was a bad one with of the GET/POST thing. Just tried to pick a generic site as an example as what I'm intending to do is probably too much hassle to explain in full.