Moffmeister, I spoke to Orange again yesterday who said (again) that they can't support anyone else's ISP other than Orange. The wifi for Orange is apparently still in a trial mode so they don't officially offer the service, hence they can give very limited support. That's the line they threw me anyway.

I'm probably going to change to Orange broadband so I can get this working. It's probably doing exactly what they want, but my signal problem remains until I can get this sorted.