An Act of Parliament (primary legislation) will often empower ministers to make further regulations within its scope after it has become law. These regulations are 'secondary' or 'deleg [..]

a.k.a. enabling legislation. Rules, regulations, by-laws, ordinances etc made by a government official under the authority of a specific act of parliament which sets out the broad purpose of what is desired, but delegates to that official’s office, the authority to create the minutia, the delegated legislation, necessary.  Whereas all parliamentary [..]

law made by the executive government under an Act of Parliament, which does not require parliamentary enactment; examples are regulations, orders, determinations and rules

See regulations.

See subordinate legislation.

See: Regulations.

Delegated legislation is a set of regulations or by-laws made by a statutory authority, such as a government department or local government.

Delegated legislation is also referred to as secondary legislation or subordinate legislation.

see secondary legislation