So here's the answer, as reported to me today from Humax:-
"The EPG contract has been finished in Australia, you need to change EPG type to RF EPG. Unfortunately, we can not provide any further IP EPG services.
<HMS-1000T>
Press HOME – settings – PVR settings – IP EPG – OFF
<HDR-3000T>
Press HOME – settings – PVR settings – EPG Type – Basic EPG
Thank you.
Kind regards"
So that's it folks, no more internet sourced EPG.
I hope Plan B works.