[mythtvnz] How to set up a new Grabber

[Robert Fisher]

I have given up trying to get 7 days of EIT data on all channels.

(TVNZ have confirmed that it is not in their "spec" to do it)

I have tried to get Stephen's script to work but have not been 
successful yet (I know next to nothing about programming but I can edit 
files).

I am wondering if someone could guide me on how to set up a grabber to 
use an xml file like

https://nzxmltv.com/xmltv/guide.xml

(or any other recommendation)

Thanks, Rob