Yes, the requirement for a referee applies to all categories of membership.

See further guidance on Referees -

• 2.2 Who can be my referee
• 2.3 What is expected of a referee
• 2.4 When do I need a new referee
• 2.5 I have only just changed employer/roles and do not have a new referee for renewal
• 2.6 I cannot remember who my previous referee was