Hi @Nellboo & welcome, so the Internet is fine, but your mum is not getting any of the subscription channels using bt tv?
I'm assuming that the Freeview channels that are delivered using the tv aerial are working fine?
How is the bt tv box connected to the router? Are you using an ethernet cable or a "powerline plug" set up?
Some powerline adapters are not compatible with the multicast streams.
BT only supply the mini connectors, which are available at a discounted rate of £20, at the time the BT YouView order is placed.
This issue has been reported before, not sure why it worked to start off with.
It may be worth temporarily running the Ethernet cable that came with the YouView box, between the home hub and the YouView box, to make sure its the powerline adapters causing the problem, and nothing else.
Are you using the TP Link adapters for anything else, or could they be replaced by the mini connectors, as you cannot run the two types together?
Ok will see if I can find it. I assume it needs to be that one or would any Ethernet cable be ok?
Any Ethernet cable will do, the one provided was about 10 or 15M I think. If they are close, then running an Ethernet cable between the two, is by far the most reliable way.
If it still gives problems with a direct cable, then more help is available on this forum.