I'm still here trying to figure it out.
It must be using a lot of data because of the buffering. Using wireless NBN (no other choice of course) and it's not super fast to say the least. Such a shame. I just found a site that suggests I can't change the picture quality. If I could change it out of HD that would be good, but I can't. I'll try tomorrow but I don't think I'll be able to keep the BritBox. Luckily I have 7 day free trial.