Slightly off topic - but why didn't you just collect your tickets as soon as possible after purchasing? (I know you don't have to... but it would make sense to me to do so!)
Surely that's the best way to go about ensuring you have your tickets - given that the machines at the stations could be playing up on the day and there could be a big queue at the ticket office meaning you could miss your preferred train.
Surely that's the best way to go about ensuring you have your tickets - given that the machines at the stations could be playing up on the day and there could be a big queue at the ticket office meaning you could miss your preferred train.