Nope it all comes down to the fact the CAA didn't want to buy a new printer which the rest of Europe has done.
Every where else their licenses are the perfect size to fit the EASA wallets.
There licenses are printed on decent paper as well and concertina up nicely and fit.
Not for us the CAA wants to use a standard A4 laser printer so all the pilots have to put up with a pain in the backside bit of A4 paper which doesn't fit that's printed on thin paper.