It depends where you start in the company. We pride ourselves on our training and development. That is why we have so many long serving staff who have progressed through the business.
We would expect an assistant to become a trainee once they are competent. A trainee will then progress to a technician, dependent on availability and how they have developed through training and attaining qualifications.
Some technicians move on to become fitting centre managers. In many cases they have achieved this by their mid 20s if they have joined us after college.