It says 'numerics only' on the outside one - so you only need to put on your number. Having said that I am challenging a parking ticket given because I had an old-style ticket that you had to stick to your windscreen (seen they have now ditched this) and it was very unsticky - so much so the blooming ticket fell down while I was away from the car so no longer 'displayed'. I wonder if I got the last, elderly, withered old sticky patch from a discontinued batch!