I thought it was time for another snippet from my own Oyster travels. Today I had to get into Farringdon for a meeting. With no services there or at Barbican I decided to use the bus from Southwark Jubilee line station. This meant that I had to exit Waterloo East via the Southwark connection and walk straight through the Underground station without travelling. There is a special setting that allows just this scenario without making a charge. When you exit to the street the gate display confirms your previous National Rail deduction as displayed on the exit from Waterloo East. In the other direction the exit gates display your balance again with a zero charge.
This setting used to be publicised on posters within Southwark station but they don’t seem to be there anymore. I wonder whether casual users are all aware that they can use Southwark station as an additional entrance to Waterloo East without incurring an Oyster charge.