Acts of the UK Parliament often give "the Secretary of State" the power to make regulations, orders or other type of secondary legislation. For example, section 22(3) of the Human Rights Act 1998:
The other provisions of this Act come into force on such day as the Secretary of State may by order appoint; and different days may be appointed for different purposes.
But as Wikipedia says, there are currently 16 different secretaries of state in the UK. So when an Act of Parliament says just that the Secretary of State may do something, then which secretary of state may do it? Does it mean that any secretary of state may do it?