The BBC on demand does not have to be downloaded for the listener to listen to different times.

A Reciva radio doesn't have a big enough buffer for this in any case.

For instance, Pirate Radio Skeus may last three hours. It is possible to call up the on-demand programme and dial-up any elasped time without pause.

So this is very different to downing loaing t and then moving a slider backwards and forwards.