Liked the series, but the pilot was rife with stupidity and holes
Tech gaffs: When the kidnapper uses the hostages phone to call Boyd FROM THE HIDEOUT, there is not reference to trying to at least triangulate the towers is pinged off! Nor any attempt to explain it away. Really? TV tech first semester.
When the forensic scientist is unable to get clean DNA from a five year old corpse (??? They can get it from Mastodons!), she doesn't try to get the familial DNA from the surviving parents. This is not sophisticated science here, nor is it a recent technique unavailable at the time of the first episode.
Procedural gaffs: The know the general area the second girl was in at the time of her abduction, but no attempt or reference to try and catch her on CCTV (and London is the most covered city in the world in this regard), even when they later learn she'd been in the grocery store that afternoon. They'd have seen her getting into the perp's cab.
When the first money handoff fails, 10 cops flood the area, showing the perp that they'd broken the "come alone" demand of the demented, vengeful perp. They should have cut their losses and had the WPC leave alone.
They do this again at the second money drop for no discernible reason, again risking enraging the unstable perp, putting the life of the hostage at risk. And why did they think that he would be stupid enough to have the girl in the same area he'd chosen for the exchange? They weren't to know his plan to abduct the WPC and that the money was irrelevant to his plan, and should've anticipated that he'd have her at another location so that, even he were to have been captured picking up the money, he would have had that card to play: let me go or you'll never find her alive. The should again have let her leave, staked out the area and tried to catch him picking up the money (the absolute standard practice in such dramas).
I'd seen later episodes before viewing the pilot, and found them much tighter in terms of strategy, procedure and logic. Very disappointed with this debut of an otherwise enjoyable series.