If there is a Child Arrangements Order/Residence Order in force with respect to a child, no person can remove the child from the Court’s jurisdiction (England and Wales) without the consent of every person with parental responsibility, or without leave of the Court.
However, if there is a Child Arrangements Order/Residence Order in favour of one parent, this empowers them to remove the child from the country for no longer than a month, without the requirement to obtain consent (as long as it does not breach the other provisions contained within the Order). This enables parents to take their children on holiday.
The situation with shared residence is less clear, as the children live with both parents. Generally, if the Order says that the child resides with both parents then they will both be able to take the child out of England and Wales for up to one month (as long as it does not breach the other provisions contained in the Order).
In circumstances where one parent wishes to move with a child outside of England and Wales and no consent can be obtained from the other parent with parental responsibility then they would need to apply for Leave to Remove the child from the Country. Equally, the parent who would be left behind could apply for a Prohibited Steps Order.