In message , Cast_Iron
writes

A happy result for those concerened, but if there had been no other
cash fare paying passengers?

Then you get off the bus. Get some change and get the next bus.
If TfL are going to force everyone to pay before they get on a bus. I
think having the right money before you get on a bus is a good deal in
comparsaion. I mean people save change for parking meters and
electricity meters so why not the bus?
--
CJG