I see that most of the reviews here were written around the time of the initial screening so many fans were keen to see the return of the show after 12 months giving it a positive response while negative ratings seemed to come from those looking at it from PC-perspective.
Personally, I am now 82.5% of the way through binge-watching the 40 shows screened to date over a 10 day period.
The show had dipped in seasons 6 and 7 but had improved in season 8 so I was disappointed with episode, particularly as a season opener.
There seemed to be too many characters for my liking, it was very wordy and the best episodes tend to be the ones with little known actors in them so seeing the lead character The Last Detective (such a shame it didn't last too long) and a former Doctor Who was a bit off-putting.
I know I have seen this episode before but, like my previous viewing of it, it proved instantly forgettable.
Not a classic.