Answering as I go here
Ive disable both TR069 options, so deactivated it and switched off the inform.
Ive also reset the rom_d from the cli, did a pin reset, then rebooted, and im back on the device and in the broadband settings, for the wan vdsl interface all the John Lewis settings had gone.
Ive changed my wan to be bridge mode, as that's all I need, set the lan to 101 and 802.1p to 2, which matches what's currently set on my hg612 Openreach Modem.
Do I need to load any newer firmware?
Interestingly, when I reset the device after the rom_d, the supervisor password changed again, I had to go to cli again as admin, and rerun echo $(cat /var/csamu) to get a newly generated supervisor password - will they always keep changing, and will there come a point in time when I lock myself out from the box from uploading something and then can't run that command?