Money saving tips for London train commuters

Since about now is a popular time to renew season tickets to miss the Jan fare rise, two - hopefully useful - tips. 
1. If your season is an Annual Travelcard costing GBP 1500 or more, buy it at Marylebone Station from the Chiltern ticket office. It then counts as a qualifying season for unlimited weekend travel on the entire Chiltern network. 
2. If your season is an Annual Travelcard, it'll come with a Network Gold card giving you a third off some fares on trains in the South East. However, it won't be coded onto your Oyster card, so you won't get a third off cash Oyster fares (eg the extension fare charged when travelling beyond your Zones). Go to an Underground ticket office (where they exist) or a roving member of staff (where they don't), ask nicely and they'll sort you out.