TfL have made a bit of a boob when switching between the 2012 and 2013 fares. The old link with “current” in the address still points at the 2012 fares. What’s worse is that if you search for “single fares” on the TfL home page, the first result takes you to the 2012 fare finder. Ooops!
For the right data you either need to click on “Tickets” then choose under the “Fares” heading, or use this address instead.