Cor, that was good! I actually screamed out loud when they poured the water on Denton.
I didn't watch the first series but I am assuming that Dot Cottan is corrupt, possibly under the influence of Tommy the WP man. We now think Dryden was something to do with Tommy too, presumably having him and Akers killed because they knew too much.
Dryden's speeding ticket was on 16th August. Do we know when Carly went missing? Was it 16th August by any chance? Carly had a mechanic boyfriend. Did she go to meet him at the workshop and see something she shouldn't have, and end up dead.
Of course, only being half way through, Denton could still be totally guilty. I think the only ones I trust are Arnott, Hastings and possibly Kate (sorry forgotten surname).
Am surprised that Mr Akers seems to be showing no grief or guilt.