British degrees generally take 3 years to complete, sometimes can be 4 years with an optional year of either taking a work placement (also known as sandwich year) or studying abroad.
Whereas in the Australia university system, certain subjects (e.g. engineering and environment science) are slightly different, which are designed for a 4 year completion time. This includes an integrated honours degree as part of a 4 year program. Business majors remains 3 years completion time.