If I were to go from LDN stations to BHM stations every weekends, (On Saturday/Friday, going to London), on (Sunday, returning to London) on advance tickets every weekends.
How much would you estimate the cost (Monthly)? Is the train usually busy (On off peak periods on those days)? I'm using a railcard.
Of course, it depends upon when you wish to travel and what flexibility you need.
Advance tickets provide excellent value-for-money, but they are only valid on the one train, not amendable and not refundable. This means that you cannot be flexible (for example "If I get off work early today, I'll get down there earlier").
If you are open to the rigidity which advance tickets exist on, and you book far enough in advance, there seem to be quite a few tickets for £5 each way. However, these are not on the fastest trains.
Examples:
Friday 10 February 2011, dep BHM 18:33, arr MYB 20:43 (change at Birmingham Moor Street, BMO) - cost if you buy now = £5
Sunday 12 February 2011, dep MYB 20:00, arr BHM 22:11 (change at BMO) - cost if you buy now = £5
If you don't like these trains, click on "Find earlier trains" and "Find later trains" - £5 tickets are currently very easy to find on these dates.
Information retrieved from
www.nationalrail.co.uk .
If you want more flexibility, these trains you seem to be able to buy "Off Peak" instead of "Advance" at £24.90. This still doesn't allow you to travel on every train from London to Birmingham, and trains still need to be at off peak time, but it means that you are not limited to a single train.
However, look at the prices of Advance tickets. If you need more flexibility than an Advance, but want to save money on an "Off Peak" you could buy two (or more) Advance tickets in each direction and only use the one that suits you best. You would still be paying only £10 single (if you bought two Advance tickets in each direction) or £15 single (if you bought three Advance tickets in each direction). However, it could be argued that this is unfair as it deprives other travellers buying these limited Advance tickets.
If you want to use trains on quicker routes or at any time, you would have to buy more expensive tickets again.
Re passes or season tickets, I don't know so other members can advise.
Hope this is helpful.