Prohibited steps order

Hi,
I was hoping someone could shed some light or advice on prohibited steps order.

My stbe has formed a very personal friendship with a work colleague, since the day I was told they wanted a divorce. This work colleague is married with 2 young daughters. However there is an awful lot of evidence that they are together, although they both strongly deny it. Won't go into too much detail as the divorce is not about their adultery. This colleagues spouse is very abusive and I know if they ever found out, they would seek revenge, I have asked both the stbe and colleague on numerous occasions to back off from each other for a bit for the simple reason I have a son and I don't want to be put in this situation. My stbe has already been beaten up once because of said colleague (not by their spouse) . Can a prohibited steps order be applied for in a situation like this, as they are not thinking about our child's safety at all.
I don't care about them having a relationship, but if colleagues spouse ever found out and my son is with them, what's to stop the spouse from going for my son.
I have stressed this to both of them but they don't see to care.
Any advice would be great and thank you

What exactly is it that your would want the PSO to do?

From what I can tell, you want a PSO to stop a relationship/friendship and to limit the likelihood of what a third party *MIGHT* do when your child is present.

Personally, I don't think the dad is putting his child in any obvious, gross or deliberate danger. One would think that he would not put the child in a dangerous situation and protect him from harm. If there is no clear risk and you are just basing this on 'what ifs', I'm not sure a PSO would work.

You say the colleagues spouse is very abusive. Is that to his wife or his children? I don't condone any man being abusive at all, but there is a significant difference between abusing his wife and abusing his children. Look up 'Clare's Law' and see if that helps. If he has been arrested for abusive behaviour then I think you have every right to apply, if he doesn't, unfortunately, as hard as it is, you'll need to trust your ex's judgement. All I will ask, is that you don't deny your son access to his Dad, as that is even worse abuse to your child.