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In page Oxford University Police:

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The power of the university to attest constables was granted by the Universities Act 1825,[1] making the University Police among the oldest police forces in the United Kingdom.[2] In 1829, the same year that the Metropolitan Police Service was established by then-Home Secretary Sir Robert Peel, the Vice-Chancellor of Oxford University signed the "Plan for the Establishment of an Efficient University Police", formalising the powers and duties of the University Constables.[3] They were supervised by the University Proctors, and had disciplinary powers over students.