You do not have an automatic legal right to see your grandchild if a parent stops you seeing them. There may however be steps you can take to get access.
There’s a different process in Scotland and Northern Ireland.
You can try to get help in seeing your grandchild through:
an informal, family-based arrangement with both parents
mediation
If this does not work you can ask the court for permission to apply for a court order. You apply for permission on the same form as the court order application.