Thanks for the suggestion but I don't have the time or inclination to reset the entire Roku stick just for Now TV, every single other app works fine just not Now TV ever since the update on 15.12.21 (version 6.5 build 8).
I do like Now TV and some of the content, but only at the discount price of £5.99 per month, it's not worth £12, which is double all its competitors like Netflix, Amazon etc and it has ads.
Maybe I'll try again in a few months when there's something i want to watch but if I come up against the same problem with the app not loading they'll have lost a customer for good.
Use the link I provided in my post to yours to get in touch with staff to report the fault.