so nearly 1 GB per hour is that right? seems really high.Well scooby doo is currently streaming at roughly 1.8Mbits/s (sky player within WMC at high quality). Which equates to, I think, 810 MBytes/hour.
... with a maximum streaming rate of 1.8Mbps down to 1.1Mbps for the live channels and 1.4 Mbps for the On Demand catch up television.