I found this from a year ago...
Peter Smyth said:
The rules from the Fares Manual are
***
Season Tickets issued for travel between two stations which are both
outside the Fare Zones area, and which include cross-London travel via
Zone 1 using Transport for London Services, must be issued as a
Travelcard Season and routed 'ZONE R1256 LONDN'. They include unlimited
travel throughout the Zones 1-6 area.
Prices for journeys that are not shown in your TIS or the Fares Finder
can be calculated as follows:
1. Find the 7-Day Travelcard (7TS) fare from the Origin to ZONE R1256
LONDN.
2. Find the 7-Day Travelcard (7TS) fare from the Destination to ZONE
R1256 LONDN.
3. Add the above two 7-Day Travelcard fares together.
4. Deduct the Inboundary 7-Day Travelcard fare for Zones 1-6 (currently
£47·60).
***
So Milton Keynes Central - Slough would be 117.80 + 68.00 - 47.60 =
138.20 per week
A monthly is 3.84 x weekly price and an annual is 40 x weekly.
...so, it should be possible to create a custom season ticket for you that would be valid from Crewe to Slough and include a Travelcard for unlimited travel within London.
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Pants
What i will have to instead then is:
Ticket 1) From Crewe to London zones 1-6 (£910.50)
Ticket 2) From London Terminals to Slough (£192.40)
This is an extra £112!
Well, no, there is a Slough to London Zones 1-6 for £119. No need to buy from London Terminals. This could be combined with a Crewe to London Zones 1-4 if such a ticket existed however it appears not to exist.
However as far as I can determine, you should be able to purchase a 'custom made' Travelcard season to cover your journey on one ticket.
--- old post above --- --- new post below ---
1. Find the 7-Day Travelcard (7TS) fare from the Origin to ZONE R1256
LONDN.
In this case that is £289.00
2. Find the 7-Day Travelcard (7TS) fare from the Destination to ZONE
R1256 LONDN.
In this case that is £65.90
3. Add the above two 7-Day Travelcard fares together.
£354.90
4. Deduct the Inboundary 7-Day Travelcard fare for Zones 1-6 (currently
£47·60).
£354.90 - £47.60 = £307.30
That is the weekly price.
If you want one month that would be
£307.30 * 3.84 = £1180.05 if my calculations above are correct.
For 5 weeks it would vary (as the above is for a calendar month) but you can add on any number of days to make a monthly season and be charged for the extra number of days at the monthly rate.
Bear in mind season tickets may go up drastically in January. It may be worth getting one to last until your final day before the Christmas break, and get a new one before the prices increase (on 2nd January I believe), if you are doing this journey for a year, then an annual is worth considering as you will be paying 2010 prices for the whole of 2011, and also it would act as a Gold Card, getting you various discounts in the South East area (not much use if you are based in Crewe though).
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Something I can't figure out is why the Crewe to London Zone 1-6 7Day season is £289.00 but the monthly is only £910.50. The monthly price should be 3.84 times the weekly, in this case £1109.76. Yet the fare is around £200 lower.