I think i may have found the answer to this on the website but wanted confirmation: do the Plusnet BT Sport packages not work with the Sky Q system mini boxes, because there is no option to add multiroom through Plusnet?
Before i upgraded to Sky Q I had BT Sport for a while though Plusnet, and i had to nominate one Sky box to receive it. But now the Sky Q boxes around the house don't have their own viewing cards, and if you buy through BT you have to take their multiroom option to use the mini boxes. The box with the viewing card may not be the main TV and may not be where you want to watch it (in my case, the Ashes in the middle of the night, in bed!).
Looks like I may have to subscribe at full price though BT in order to get the cricket.