OP had it backwards about the oyster and octopus cards. The octopus card in Hong Kong led to the development of the London oyster card. https://en.wikipedia.o

OP had it backwards about the oyster and octopus cards. The octopus card in Hong Kong led to the development of the London oyster card. https://en.wikipedia.org/wiki/Octopus_card https://en.wikipedia.org/wiki/Octopus_card