Richard J. wrote:
But I still feel that PAYG is a daft term for Oyster, since TfL want it
to be a replacement for cash fares which really are PAYG and don't have
a £3 initial charge.

Depends how much you value your time.

Anyone more senior than a kitchen cleaner will spend £3 of their time a week
queuing to buy cash singles.

Raoul.