I don't think even NOW customers will get it free. Everyone will have access but only Sky Cinema customers direct to Sky will get it included.
To get it on VirginMedia boxes - Paramount+ have to add it.
From my understanding, the free offer for sky cinema subscribers is only valid if you subscribe to sky cinema directly through Sky or NOW (as opposed to through virgin or bt)
The good news is anyone will be able to subscribe to paramount+ directly through the website or app that will be avaliable on a range of devices like fire TV, Google, apple, and roku
I doubt Virgin have is any rush to add it directly to their boxes based on there track record so far. Broadband seems to be more their priority these days....
1.2Gb/55Mb in Oxford (area 31) using SH5