Once again one thread has me thinking of another point. This is the one about the set down restriction at Wembley Central. It had me thinking that if you were to board a set down only train would you be charged a fare from the previous non set down stop ? ... and then what if you had a Southern Daysave or Rover ticket valid from the stop before ? What then would be the 'punishment' for boarding a train at a set down only stop?