Yes, the Home Office's own research, the government's own research, was peer reviewed by the internal mechanisms the Home Office uses. It's not the same as an academic peer review system, but it would be fair to say that it was high-quality government research.
My sense of its limitations is that it focused only on the pilot. We've not researched electronic monitoring when it becomes a mainstream measure as much as when it is brand new. I think you're perhaps always more likely to get a better result on a pilot than you are when you study the mainstream use of the same technology. However, I wouldn't want to fault the research.