I am afraid that you cannot unilaterally revoke parental responsibility once obtained. Parental responsibility can only be removed by order of the court on application for a specific issues order where it is shown that a parent's parental responsibility is not in the best interest of the child.
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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