like, when you're actually on the train, is there a way they can check it?

Just saw a bunch of inspectors stood by the machine checking people were scanning their cards while they got off the train.....but do they have a machine they can use to check your oyster ON the train?

Are the days of 'TICKETS PLEEAAAAASSE' over on some of our better London zones (4,5,6) ?

My friend says that if there isn't then he might start bunking between stops with open ticket barriers.....the cheeky sausage!