I continue to like my Oystercard, the smart card for using buses and tubes in London. (See previous post here ). They've just emailed me this info

Oyster Pre Pay customers can now benefit from daily price capping.

Make as many journeys as you like using Oyster Pre Pay in Zones 1-6 within a 24 hour period - from 4.30am to 4.29am the following day - and you will never pay more than the price of the equivalent Day Travelcard. If you do, we will refund the difference. Alternatively, if you're using only the bus or tram you'll pay no more than £3, the price of a One Day Bus Pass

I wonder where there'll go next with this. Maybe they can get retailers to let me swipe my card to get my paper in the morning? Not to mention the choccies from the machines on the platforms, to munch while waiting for the train...