"...this legislation which effectively gives under cover officers the right to murder or assault anyone without any fear of punishment."
Absolute rubbish. That flagrantly alarmist and rabble-rousing statement takes no account of the safeguards and limitations proposed, including oversight which takes account of the requirements of the Human Rights Act.
The brave men and women of the police, security, intelligence, and armed forces who undertake these particularly hazardous duties on our behalf need the clarity and protection that this legislation would provide.