This Autumn, social workers who look after a child’s interests in the family courts are being given new guidelines to help with the cases when children refuse to see the other parent. For the first time, these new guidelines will consider the possibility a child has been deliberately turned against one parent, by the other parent.
You can read more in this excellent BBC News article – When a child won’t see one parent.
https://www.bbc.co.uk/news/education-45448100#
and yet more about Parental Alienation on the CAFCASS website
https://www.cafcass.gov.uk/grown-ups/parents-and-carers/divorce-and-separation/parental-alienation/