I commute to Farringdon twice a week and on both sides of the barriers, some of them have tape stuck over the slot where you insert a paper ticket to open the barrier. Is there a reason people with paper tickets are denied access through some of the barriers? It can be annoying as in the middle of a crowd of people trying to exit at 9am, it is not always possible to see which barriers have the slot blocked until I am very close to them, then I have to do a last-minute switch to an adjacent gate to get out if the one I am in line for is taped.