Personally I haven't had the guts to try my prepay on a bus yet. Does
anyone know why it does work properly on some buses (i.e. 70p charged)
but not on others?

I suspect this is to do with roll-out.

Do be aware that as pre-pay on buses has nor formally been launched
your pre-pay is not valid for travel. In the event of a revenue check,
expect trouble....


I tried to use prepay on the bus the other day before I realised it wasn't
valid (of course there is nothing to say it is not valid on the busses
when you load up your Oyster at a ticket machine at a tube station). Of
course it didn't work, and the red light came on. The driver looked at
his screen, printed it out on a ticket and gave it to me, and waved me t
hrough. The ticket read something like:

***ERROR****
transaction failed

Travelcard valid throughout route

No wonder the driver thought it was a valid ticket!

SR