As we discussed briefly earlier, if “probable” is added, the challenge is that it's not used to date in this context. It's used in other contexts, like investigative powers, so we would have to wait and see how the case law interprets it.
One of the possibilities is that it would make it harder to get the peace bond because it would be distinguishing a “reasonable” ground from a “reasonable and probable” ground, so it could potentially require more evidence of something to justify the fear. Unfortunately, we don't know for sure because the other peace bonds all use the “reasonable grounds” term, so we don't have a concrete example of case law using that term in the peace bond context.
The investigative context is quite a bit different, because in the peace bond context you don't need to have an offence already; you're trying to prevent one. It's a preventative measure, so it's a bit of a different context. We'd have to see what the cases come out as saying.