Ah - thing is, I think I would actually be scared of a real Big Mandy. Ashley McGuire is excellent in This Country (I am a big fan!).
Roadside Mum is, very much like Jack, TwitterHard. The sort that wishes she was hard as nails, intimidating boss lady. In reality, she is very much the sort that will be shouting about how hard she is, in front of people she can intimidate (unfortunately, her kids, in the main), and then would tit herself if she was confronted in real life, and become severely disabled, PTSD suffering, police calling, wuss quicker than it takes a can of hoops to get rinsed.