Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
Who has the day to day care of the children?
You both have equal parental responsibility for the chidlren and the right to have them in your care
If you do chose to leave and take the chidlren with you then provided you stay in the Uk you cannot be accused of kidnapping
In fact your partner has equal right to move out with the chidlren - neither of you has more right than the other.
The fact that you have more of the care of the children means that if the matter goes to court because you cannot agree then they are likely to spend more time with you
I hope that this is of assistance - please ask if you need further details
Yes you can move out . It will not be seen as kidnapping - the police will simply check that you and the children are safe and well.
Your ex will be entitled to have a relationship with the chidlren and you will have to agree contact arrangements
he may apply to have the children live with him - then the court will have to decide what is best for the children
Rather than simply "hiding" once you have gone then immediately arrange to discuss matters using family mediation so that you are being proactive