Not reading the last page to avoid spoilers, but wow I loved season 1. Some of the best tv I've seen in awhile... probably since River which was also BBC.
I also thought the end was a bit telegraphed, I wasn't 100% what it would be but it was clear he was up to no good. I don't think that hurt the show at all, and I don't think it was really meant to be a surprise.
The only thing I didn't like and thought was a bit of a cop out was