Does that mean than an FE with LAPL/PPL privileges cannot perform a proficiency check for renewal of SEP class rating if the applicant holds a CPL ?
No, I have seen it in writing from the CAA that an Examiner operating on a PPL medical can test for any rating within their privileges on any licence holder. The question was posed because a number of Examiners wanted to drop back to using a Class 2 medical which reduced their licence to PPL privileges.