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I would guess you mean flashing cards. Because I write numbers (along with the players name). To be honest I coach and sometimes I’m allowed to referee them. If I know the player, I just write their initials and number and show the card- I know who they are I don’t need to ask their name. That’s how I see it. One lad who I coach I have booked 4 times, I always write the same set of stuff down on my card for him and I know exactly who he is.Anyone know what level writing numbers is acceptable at in England?