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If you are interested in streaming from box to box, then the answer depends on the codecs used in the V6 box.
If Virgin are still using mpeg2 then "typical MPeg2 bitrates are ~16Mb/s for 1080i and ~12Mb/s for 720p"
I currently have two V6 boxes and can stream HD content comfortably between them over the built-in WiFi (I have a Superhub2 AC). I have V6 box/TV combinations in 2 rooms with the hub in a third.
I'm not bothered about streaming 4k as I have no plans to upgrade my TV sets to 4k any time soon. I would even as to suggest that, unless you have 55" (or preferably larger) TV sets, you won't see a noticeable difference with 4k - although HDR would make a difference.
I think they are just playing safe as people have had problems with 2 V6s streaming content wirelessly.
in theory they should be able to do it, and note they don't really connect directly to each other, both connect to the hub and streaming goes via that, and as wifi bandwidth is shared amongst all wifi connected devices, in less then ideal conditions there could be problems.
safest to have at least one v6 connected via Ethernet or powerline.
Thanks for the fast reply, according to the V6 box network status I have a signal strength of 70% with 54Mbps over WiFi. I think that should be enough but I get a message saying the box cannot be reached because of a network problem.