Thank you all for your replies.
They have been very helpful and greatly appreciated.
I have some news to share.
After a short contact with her I can confirm that she is trying to enroll the children to a French school, this is why her BF needed my contact details.
As it seems, she is trying to sneak them out of the UK but she is having some difficulties.
I arranged a meeting with my solicitor on Wednesday and I will find out what I should do from then on. I am afraid I should have to stop her before she moves there, so I am thinking of notifying the school and getting a Prohibiting Order as well.
I am not sure how it will be with contact with my children until a contact order is settled as she is now backing out to them spending two weeks with me in summer, that was arranged before all this madness began.
I will not contact her until I get advise from my solicitor on this, too but I don;t know how to proceed. I offered
mediation but she called my solicitor and said she cannot pay for this and she cannot get legal aid either, which is weird as she is not employed and the only income she has is the child support that I am giving her. Any thoughts on this?
Thank you all for your help.