If you have PR in the UK and your child is living in the UK under the jurisdiction of the UK Court all the rights will apply including the need for the other parent with PR to need either your consent or the leave of the Court to remove the child overses. Has this been obtained for the child to move to Denmark? If so Danish law will apply although it is unlikely that a court in that country would deny you their equivalent of PR.
If you have PR you can most certainly apply for the child not to removed to Australia.
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• Get a divorce
• Have contact with my children
• Make a small claim
•Write a letter of claim
•Obtain a Grant of Probate
•Get legal advice and help with my case
•Make a Will
•Change my Name
•Prepare a legally binding agreement
• Sever a Joint tenancy
• Prepare a Partnership Agreement
• Sell a Jointly owned Property
• Appoint a Guardian for my children