Mmmmm ....
...... "Certificate of Experience" ???
Yes, that takes me back a bit, we haven't had them for years.
Initial licence issue - LST (Licence Skill Test)
Yearly check - LPC (Licence Proficiency Check)
Just to explain, for those that are fairly new to this subject, it used to be that once you had your licence all you needed to keep current was to fly 5 hours a year and get an authorised person (usually your instructor) to sign a Certificate of Experience. A simple paperwork exercise that didn't take into account any possible reduction in ability.