CPD does not replace qualifications. Rather, CPD is about training standards and the process of a person being seen to continue to develop skills in their vocational practice.
It is essential, to ensure that you maintain currency in skills, legislation, knowledge, or approaches within the industry you work within. It is a mandatory requirement, set by the Awarding Organisation.
Awarding Organisations require assessors and other professionals, who are both qualified in the industry area, but also are working in industry and doing CPD to ensure they are up-to-date with key themes that apprentices will be doing day to day in the roles you are assessing them in. This also applies to Internal Quality Assurers.