There appears to be no spare ports in the ONT when I flipped the door open, so can only assume (!) that it's all hooked up already.
Famous last words I suspect....
It shows where the LAN port is on the ONT.
The one on the right is the Ethernet feed from the ONT, so the socket that its plugged into, will go to the room that you want the home hub to be in,
The other grey cable I suspect is just a temporary looping cord used when the cabling was tested.
It looks to me that you have four Ethernet connections on that plate, going to different parts of the house, so it actually possible to put the home hub next the the ONT, and connect the four ports on the home hub, to those four sockets, if you want an Ethernet connection in each room.
It looks like the builders have done a good job, and have also connected the fibre voice phone line into the phone socket.
You have plenty of options there.
Thanks @Keith_Beddoe - finally something they have done quite well 😉
So if I were to connect the hub next to the ONT, I'd take the dark grey cable out of the wall socket and plug it in to the WAN socket in the Hub, then just connect back out via ethernet to each of those ports in the wall?
Fair enough - we shall see when it gets delivered. I'll report back once it's all installed in case anyone else has the same Q