At the moment it seems I've tried every trick in the book trying to get this to work. I need some way of encoding AMF requests and then decoding the responses. At this point I don't care what language it's in, as long as it's doable and free (as in to me), however I would prefer PHP.
I don't know what other information is needed, but I'm happy to supply more info - just comment this!
Thanks.
EDIT: It seems the version of AMFPHP I was using was broken. Using a different version that I extracted from somewhere worked.
You can use amfphp for PHP side or from the zend framework or weborb for PHP who is also free