For no other reason than it looked neater, I did my first class rating renewal after I got my CPL on a new (CPL headed) sheet. Saves explaining to a gendarme in my schoolboy French why the letters "C" and "P" are interchangeable in British English
Didn't realise it would save me from having to stage a re-run of Agincourt, but that's obviously an added benefit.
(And then I did my CRI and IMC, both of which are on yet another, CPL headed, sheet. This system really isn't simple is it - hence that my logbook currently shows 7 different expiry dates of assorted privileges, that I need to monitor. Thank heavens for computers!)
Absolutely no risk I think of my upgrading to ATPL this side of the second coming. C I am, and C I shall remain! Used mostly as a P.
G