http://www.nationalrail.co.uk/times_fares/ticket_types/season_tickets.html
says
That implies that a season ticket starting 2 January can only be bought from noon on 1 January. Surely that can't be right? That can only lead to long queues at the ticket office on Wednesday as presumably a lot of people will have let their season tickets expire before Christmas and will not want to make a special trip to the station on 1 January.
says
If the start date is a Saturday, Sunday or Monday (also Tuesday after a Bank Holiday), the ticket may be issued from noon on the previous Friday.If the start date is another day, the ticket may be issued after noon on the previous day.
That implies that a season ticket starting 2 January can only be bought from noon on 1 January. Surely that can't be right? That can only lead to long queues at the ticket office on Wednesday as presumably a lot of people will have let their season tickets expire before Christmas and will not want to make a special trip to the station on 1 January.