I'm still confused by the unnecessary(?) extra gateline at Stratford Jubillee line nearly a decade after they removed it!
Walthamstow Central is starting to feel like a single station. A subtle but welcome change.
The Jubilee Line project decided, for reasons only they understood, that they wanted the JLE gated off from other lines where this was feasible. This meant there was an interchange gateline at Stratford. It was removed because when Oyster PAYG was extended the ticket logic of "enter" then "exit" would never work with an interchange gateline which created "enter" "enter" and then "exit" or "enter" "exit" and "exit" validation sequences for people using it. Therefore it had to go. To be honest it was a daft idea but the idea of "money money money" won over senior people at the time.