Ah, I missed this post first time round.
When you refer to "All4" & "My5", do you mean the branded streaming apps? Or do you mean normal OnDemand programmes that just have the branding on them? That makes a difference for starters.
And as alluded to by @Roger_Gooner - your V6 connects to the internet via your Homehub, that connection can be Ethernet cable or wireless - what is yours?
One diagnostic step here will be to test other internet-based functionality on your V6, and so the answer to my question in second paragraph above will be crucial.
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