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Well I did call the number & they advised me to talk to Families Need Fathers who I rang last night. It would appear that I only have a case if it is in the best interests of the children to not be with her. The fact that she has beaten me black & blue does not come into it (it would, however, if it was me that had been abusing her!). I would have to prove that the children would be better off with me - I don't have any "hard" evidence that would stand up in court, only my word against hers.
Interestingly, they also said that if its stipulated in the Separation Agreement that I have the kids 3 nights a week, it means absolutely nothing - she could turn round & say I'm not having them at all & there would be nothing I could do about it.
Frustrated!!