Section 118 requires the Secretary of State / Department of Health to publish a Code of Practice for the guidance of those involved in the admission of people to hospital (and registered mental nursing homes) under the Act, and those responsible for their treatment.
The Code covers many aspects of the operation of the Mental Health Act. In particular, the Code of Practice may specify additional forms of medical treatment to come under the scope of Section 57, where the patient's consent and a second medical opinion are required.
Copies of the existing Code of Practice are available from The Stationary Office.