Has anyone ever done their LOs/Nieces/Nephews Birthday cards for cbeebies? Did it get shown?

I want to do Tyler and the boys cards for their next birthdays.. But they must have so many people sending them in and wondered what the chances are of them getting shown?

Elaine and boys xx

some days they do absolutely masses so they must try and do as many as they possibly can - you have to send them in really early and i've never thought about it early enough.
could you could hedge your bets and send in more than 1 card and do it really early?