Yesterday I ordered 2 of these for 18 july for £12 each. Rec'd reservation code from Southern but machines at Victoria do not recognise the reservation number. Can we only collect these tickets on the actual day of use ? I would like to collect in advance as i live in watford where there are no Southern ticket machines. Info does not suggest you can only collect on the day, just says 2 hours after purchase / reservation. Thanks in advance for your help !