I agree Sweep my maternal GM was my rock until the day she died. To have been denied that relationship doesn't bear thinking about.
Whether we agree with it or not, whether or not it is something we would do, the law is the law and under the Children Act children have the right to know their extended family; GP's, aunts, uncles and cousins.
When GP's are successful in obtaining a contact order through the courts it's because the children's right to have that contact with their GP's supersedes the rights of the parents to deny it.
I agree March there are "some not very nice people out there" and some of them are the ones who deny their children their GP's, not to protect them, but out of spite and malice.
This topic has been discussed numerous times on GN and of course the repercussions of going to court must be given serious consideration. That said, if GP's wish to take the legal route that is there decision to make, just as the parents of the children have taken their decision to end the relationship their children have with their GP's.