Ashley Brown wrote:

Interestingly, this says that:

"Oyster Pre Pay users should board through **any** door and touch
their
card flat on the yellow reader as they board the bus". (Emphasis
mine).

This is the case with quite a few bendy routes now - the buses for the
73 and 25 were delivered with card readers fitted at all doors, and
they were commissioned a few weeks ago, and the 521's Citaros seem to
be having them retro-fitted. IMO an excellent idea and one that should
have been put in place before the buses were put in service.