@Anonymous User
You have pretty much done everything I would suggest.
Jump onto Live chat to see what Now TV can do, perhaps its a fault with the channel and they are unaware of it.
https://help.nowtv.com/article/how-to-submit-a-complaint
Click "chat online" underneath 'chat to an advisor'
As a backup you can always send an email.
Hi guys..
Finally got it sorted with help from Now TV...
@Anonymous User @gavs82008
Hey Foggy
Just to add to Gavs advice, you may wanna contact Roku support as well, just to see if there's anything gone wrong at their end, although rare stuff happens to them as well.
https://support.roku.com/en-gb/
UK Bob
Exactly the same problem - same devices too!