Thank you for all your advice and help. I would like to say I know this situation isn't good at all. It isn't as simple as just leaving though.
As others have said it is a potentially dangerous time. Although day to day is "fine" no threats or acts of violence it is a controlling coercive relationship.
He is a manipulative narcissist who truly believes throughout this that he's a nice guy. He is extremely charming to anyone he meets. If it was my word against his, id guess a lot of people would believe him the charming, articulate, funny business professional over me.
Why? Because I'm at that sensitive peri/menopausal age where I'm just over sensitive. I mean look what happened last time. He just gave me a little slap and got a caution for it. Poor lamb. He's always walking on eggshells around me.
It didn't happen overnight getting to this point, it's like waking from a fog and realising that everything in the past was for his benefit. Everything. Every decision, purchase and all of it had a very plausible reason at the time. But then you look back and realise he is the main role in this household, we are the supporting acts.
I would describe myself as strong and intelligent yet here I am.
People have said they would have left after being hit. After being hit my focus was on the family, trying to protect the family unit. I genuinely thought being arrested would be a wake up call for him. That he would in a few days say he was sorry and that it was the best thing that had happened to him because he's realised how badly his behaviour had gotten. He could get treatment, change, recover. How wrong I was.
Hindsight is wonderful because if I had my time again, when he hit me, it would have been the moment we split.
As I said above, the period after when I thought he would improve, beg for forgiveness etc., and then didn't was a complete revelation that this relationship is one sided, one way and always has been.
People have asked what I'm worried about re the children after a divorce. He can't be trusted with them. He can't deal with the pressure of them. He believes children should be chastised. And it all goes back to the same manipulative description earlier. He is entirely plausible and would be in court.
Even now I'm sure there will be some people reading this and thinking I'm unhinged because controlling and coercive relationships are difficult to understand.
He bought an all singing and dancing practically new car which we didn't need and can't afford. I couldn't stop him. People in normal relationships will be saying what do you mean you couldn't stop him? Because in this relationship, in his mind he can make these unilateral decisions. Before I would believe his bullshit reasons about why it was necessary to have this car (because there's always a plausible reason) but now the fog is lifting I can see he is a grandiose narcissist.
So I'm not focussed on the tracker in itself. It is an act that can be independently documented without grey areas. It's not my opinion that it's wrong, it is actually wrong, it's most likely illegal.
I don't want to be a story in a newspaper. I want to be able to get some form of protection in place or evidence for it before something violent happens.
Even if I take the children and run it's short term, there will still be a divorce to proceed with, our finances are very complicated, child arrangements, so we will still need to interact.
I'll be trying womens aid again this morning. I will pop to the shops and go to the police station too but most likely not today as the children are around.
Thank you for your support.