Wouldnt it be great if one of the most expensive train systems in the world could just employ a few people to stand and check tickets like at waterloo, instead of using these gates. 1 person at the gate on platform 2 and 2 at the gate on platform 1. You're going to need to people anyway to man the gate and angry customers!
Im up for printing stickers and sticking them up. you can get 5000 stickers printed for about 80 quid.