He spoke at length to MG, I’d suggest re-reading those chapters.
The problem with the PoW is that it’s a place SL was meant to visit at some point on the Monday, yet police barely paid any attention to the pub and its staff.
DCs Jones and Hill visited SL’s parents’ home, followed by SL’s home (which they broke into), but inexplicably they didn’t visit 37SR - indeed Jones told DV he’d ‘never visited’ 37SR, despite it being the location around which SL’s abduction is meant to be centred.
They leave a note on SL’s door asking flatmate NB to contact them, which he does on the Tuesday afternoon, but by then DS Carter had already held a press conference alongside SL’s parents and AL, and the establishment of the ‘Mr Kipper’ narrative was well underway. Police hadn’t the first clue what had happened the previous afternoon - at that point how could they even be sure NB wasn’t involved, given they’d not traced him? - and the only witness sighting was HR’s highly dubious one of a couple outside 37SR - a location the DCs hadn’t even visited!
‘Keystone cops’, I think NB called them. Sounds about right.