I can't find anyone other than The Mirror that confirms this.
Well even The Mirror didn't confirm it, and even say in the article that the BBC hasn't made a decision. It's all speculation on their part given the ratings and a "source" saying the BBC are disappointed with it.
One of the comments brought up a point. "Also, most of the 1m viewers that watched the first 2 parter on BBC1 probably then watched the rest of the series online, because the entire series is still available to binge watch on BBC3."
I wonder how many viewers did binge it all after discovering it was a thing rather than wait a week to watch it on late night tv?
For three long days, I felt the cold hand of death on my shoulder. Lost in the depths of despair I tried to figure out what I had done to deserve this. I wasn't an evil person. The worst thing I'd ever done was kick a pig - School trip to Heston Farm, 1964, I maintain it was self-defence.