Yes, grounds are unreasonable behaviour. No allegations of violence at all.
Unsure - I asked her solicitor to clarify the situation but had no response. I think she would like to, but she is close to her mother that lives approx 1 mile away from family home. If she did it would involve taking children away from all their extended family (both grandparents, all aunts, uncles, cousins etc) so I would try to prevent it.
I really don't want to pay her costs, the most I would live with is to counter offer £205 (half the petition) but I'd rather explore how I can avoid at all.