Official publications - Acts of Parliament

In-text citation:

The Medicines and Medical Devices Act (2021) encompasses both Human and Veterinary medicines.

or

The new Medicines Act identifies the appointment of a Commissioner for Patient Safety (Medicines and Medical Devices Act, 2021).

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Reference List

These are listed by title, however you should also include the chapter of the Act in your reference list.

Medicines and Medical Devices Act 2021. (c.1). Great Britain. London: The Stationery Office.

Note: Identifying the Country where the Government document originated is important, particularly where you are using Acts from multiple countries.