Unfinished

That is very good to be fair, fingers crossed they'll figure out the cause, I would have thought it would be CG-NAT but given you now have a static public IP maybe it is something else, do keep us posted!

Ok, thank you. They know about the R2 and are not that bothered. It was easy to determine that the issue is with their end, as reconnecting the ISP router gave the same strict NAT.
Apparently other customers have not had the same issues with static IP addresses and have open NATs. I'll know more tomorrow, but good to see that they are customer focused.
Edit: I couldn't see the DMZ for looking, I can now though, thanks.

Thanks for the info. I'll not post any more comments here, as I've got a similar thread running on the R2 forum.

Unfortunately a second line is also a no go, as with three xboxes, that's a lot a data transfer for updating.
I'll give the ISP a ring later. Thanks for the help.

Unfortunately a second line is also a no go, as with three xboxes, that's a lot a data transfer for updating.
I'll give the ISP a ring later. Thanks for the help.

Thanks Fraser,
I didn't get a password or account login details, so possibly not PPPoE. I will try to connect directly and reboot when I next get the chance.

In theory yes you can connect the R2 direct to the ONT and bypass the gateway completely - there should be a sticker on the underside of the gateway with info on how to access it if you'd still like to use it.
Give it a reboot and it should get a connection, if not you may require PPPoE or it may be that they've locked it to use their gateway