I just tried a different proxy - you never know, exetels proxy might only doing certain things and might not always be 'on' - and it worked! Data came down, and I'm currently 62% through Loading Data!

So maybe this approach will help other people.. I agree it might not last, but at least it's something.

I've been corresponding with exetel again today, hopefully a better solution soon.. Given that using an external proxy fixed it, you'd agree that it's definitely a proxy issue?

Ian