Just rang the Telecom helpdesk, they had no idea.
Tried setting up a proxy server to 210.55.11.73:80 and browsing to http://myhomepage/ as advised, but no luck.
Obviously I can connect to other sites (google.com) etc. but the redirect to TWorld doesn't want to work.
Anyone know what settings I need? Do I need a WAP proxy server or something?