Cock Robin 10 Oct 2015, 11:43 am #124 Cock Robin Cock Robin Cock Robin Posts: 2778 Threads: 20 Joined: Oct 2014 Reputation: 0 RE: Arriva North East: Latest News & Discussion - October 2015 (10 Oct 2015, 11:08 am)citaro5284 wrote Normally they are put on just before it goes for its MOT, just to prove the correct glass is used I've wondered about that for years! Has been various colours.