On the other hand, I suppose you could always "maintain competency" by simply carrying on doing your job. That is, by being
Dinosaurs probably carried on what they doing right upto the moment they sunk into the tar pit!
These days there is the need keep up with your training and CPD otherwise you may find you've become the Dinosaur.
"Portfolio of your activities"? What's that? Do you mean your time-sheet?
I take it he means similar to the lines as preparing for Engineering registration and not VRCT, a time sheet just shows you've turned up.
Although before I worked in the NHS the company I use to work for used job codes. There was codes for user abuse, bad workmanship, warranty failure, and various other reasons for failure. Along with tracking the number of times an item was returned in a year, competency and training issues could be identified in both staff and customers.