My previous post on this question lamented the fact that lots of people don't seem to know that they can get discounts on travel on the London Underground network by loading their Young Persons Railcard onto their Oyster Card. Just take both railcard and Oyster card into any Tube station, and they'll do it for you. Well, now I'm lamenting it double, because things just got even better.
With absolutely no fanfare, TFL have extended the YPR discount to off-peak single fares, as well as the previous discount on the off-peak daily cap. See here for details. So now an off-peak zones 1-2 single will only cost you £1.25.
For those of you who are wondering, the off-peak daily cap applies as long as your first journey in the day came after 09.30. That is, you don't have to make all journeys in off-peak times in order for the off-peak cap to apply. For single fares, peak is 6.30-9.30 and 16.00-19.00. (For anyone who wants to stay out late, the "day" finishes at 04.30 the following morning).
For some reason, this seems to have been completely buried by TFL, I even had to edit the wikipedia page myself just now to contain the relevant information! My post, which comes from a relatively tiny blog is still in the top 10 hits on Google for "Young persons railcard oyster", for some reason. This information could be saving quite a lot of people quite a lot of money if they knew about it. Please tell your friends!