Yes you can switch the position of the boxes all you need to do is power off both boxes, disconnect the coaxial cable and then move the boxes positions. You do not need authorization from VM as they connect to the same street box.
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Sorry to ask a more general question on the back of my earlier tech Q and the excellent answers, but would a HDMI cable be able to carry a decent signal say 10 - 15 metres? Would a "fibre optic" HDMI cable manage it?
I'm asking as if I swap my boxes, I'd like to run existing recordings from my (full) TIVO back through to my main room, deleting the content over time, whilst using the V6 box as my new main box.
Don't forget that as long as both boxes are connected to the internet you can view/manage the recordings on each other, so you can have Ethernet from the Tivo to your hub and can use either wireless or ethernet from the V6.
Many thanks to Ernie and to all those others who've given advice. I have to say the suggestions have been a world ahead of the (keeping this polite!) rubbish I got from Virgin who just wanted to flog me a sim card I didn't need.
I'll swap out the boxes so the V6 will be the main box - could be last step to being sorted - and report back.