> A consultant psychiatrist’s note says Bennett had a diagnosis of post-traumatic stress disorder from a serious house fire and is likely to have been unable to comply with police instructions because she was experiencing a severe panic attack.
I'm fairly sure the concept of a police constable giving a member of the public a "lawful order" doesn't exist in UK law. There are laws that give the police discretion to do things in particular situations, but no blanket ability to issue orders.
And thankfully, illegality is determined by the courts on the basis of evidence and circumstance, not the police.
Over window tinting.
But she could very well be having a legitimate physiological response (of which a panic attack could be one)... in which case she's not "being an idiot". As long as it was a good faith emotional response, your conclusions still aren't warranted.