In article ,
Tim Roll-Pickering wrote:

Another problem is that a lot of TfL staff don't seem to know how to
correctly use Oyster at complicated stations like Stratford. There are
similar problems with the DLR - I've never been sure if one has to touch in
twice if starting at Stratford, or how to correctly change from a ticketed
mainline service to the DLR on Oyster. "Always touch in, always touch out"
becomes a meaningless mantra if you don't know which is which.

Yeah! Just when I feel I've got the hang of using Oyster PAYG in
tricky situations, a trip to Stratford feels like a trick question on
the "Oyster users' test".