You know, SH would have been better off/more believable claiming she was aware of the stuff being moved and thought it was stolen goods or something, instead of this blind denial of everything. That then gives her a reason to lie to police, a reason to clear off to her mother's and doesn't leave her trying to explain how she never heard any of the commotion including stuff being moved from the loft right outisde her bedroom.
I wonder how much SH has turned a blind eye to in the past, so was perhaps used to pretending to know nothing about what was going on under her nose.
Just thinking about it, this couple had been together 7 years, neither with a proper work history, living on benefits yet could afford to run a car and have £10,000 in savings - despite having a child to provide for.
We know that NM worked cash in hand whilst claiming benefits - so she obviously turned a blind eye to that.
We know that NM gave a different address to that of SH despite living there, which could suggest that both were claiming benefits individually, with SH getting more than she was entitled to if claiming to be a single mother. So, benefit fraud.
It appears they didn't have a tv licence, so again breaking the law - albeit minor.
So, if NM had a history of getting involved in less-than lawful activities, and SH either participated, or ignored what was going on (for example if he was dealing with stolen goods), then it wouldn't be that difficult to believe that she could have suspected he was up to no good (passing on stolen goods etc) , but told the police that she hadn't noticed anything, as she didn't want to be questioned too much about what was going on, or about what she knew about previous things that had gone on.
So, once she had denied seeing or hearing anything, and once NM had also told that story, I guess it was impossible to go back on that and admit to seeing or hearing some of it, as she then looks guilty - and he then looks like he is covering up for her.
Just giving her the benefit of the doubt! I still think the pair of them are lying through their teeth though. His story is complete nonsense.