
Jeez Louise, log in to the router via telnet, unlock the admin functions (BT locked them down after people started using HHs on other ISPs) using about five minutes of clue and some easy peasy priv escalation, (or google it if you really are that incapable) remove all privs from the RA role and all other BT supplied users, set up your own.
Safe as bloody houses. And about the second thing you should have done with a brand new wireless router after changing the encryption to WPA.
Seriously though, I have to agree, firstly WTF do BT think they're up to providing a remote admin login in the first place ? Secondly, although I'm making out like it's just that easy, Joe Random User has little or no chance of realising that this kind of thing needs doing.
Bad BT !
Also, their web interface sucks a fat one, nice if they fixed that while they were busy.