I came up with a theory about PQ and Nige in a boring meeting today. Have posted it on the other thread and copied it here. I keep reading both threads to keep up with it all 
I have a theory about PQ and Nige. When the police found Mark Latimer's fingerprints in the hut, he said it was because he'd done a plumbing job there and she had given him the keys.
PQ denied it but then Ellie checked on his paperwork and he had worked there. Nige could have had a copy made (quick trip in the van because he'd forgotten his phone or something) and then used the hut for stashing or dealing something dodgy he was up to.
As the police didn't find it, it could be drugs and not whopping canisters of diesel. Cash he could hide at home, unlikely to be searched but drugs safer somewhere else.
PQ might have disturbed him - and maybe Danny was there by chance or not, if he was delivering the drugs for Nige and that's how she got the skateboard and what's between them.
She could also have dropped Danny's mobile into the paper bag just to cause trouble for Jack. The real culprit would have chucked it in the sea. Maybe that's what Nige did with the smartphone Ellie thought Danny had.
And, , Ellie's husband Joe is involved too. Hence giving Tom the skateboard to scare him. She didn't seem to know that Ellie was a policeman. Wonder if it was after Tom told her that, that she decided to give him the skateboard but she was targetting him already because of the dad.
Why didn't Tom call out for his policewoman mum when he came in?