Yesterday, the 8th I couldn't stream above 720p without a massive amount of stuttering and pausing. I had to switch down to 720p on youtube.
Amazon Prime streaming would not light up the "HD" on the bottom left of the screen to indicate HD playback, and you could see this watching.
It seems fine today, Thu 9th. I don't usually have problems streaming at 1080p.
ZeN Unlimited Fibre 2