In the UK a child has the right to know their extended family, it is part of the Children Act. I don't know why you don't know this Starblaze as there are more than 32 pages discussing this issue.
The law in the UK MamaBear to my knowledge has only so far been called upon by GP's. The GP's need to ask leave, the permission of the court, to take their case to court. Only with the court's permission can they proceed to court.
This thread was started by a GP who successfully obtained a contact order to see her GC so successful cases may not be common, but they do exist.
A parent who breaks a contact order can be fined, given community service or a short period of imprisonment. In the case of a GP's contact order, a P has not been given a custodial sentence however, there is provision within the law for such a sentence to be given.