look at this about 1/3rd down. The bit about TV and Radio catch up 10Gb+
Says about 700mb for 1 hour on the better setting, what I use, find the SD version nasty like watching a good old video.
Dad has a new bluray recorder/ freeview thing and I have the older model of what you have, dvd recorder/freeview. No I player on mine as did not do on the 2010 stuff, Now dad bought this about 6 weeks ago in readyness of the telly arriving Saturday. All panasonic stuff and 3d. Less than mine was 15 months ago.
The way it goes as good or better and now less than 1/2 price!.
To the point, there was a setting for the sd or HD on the viera cast thing ( or whatever it is called now), as had a play with dads new toy and did some recording and set it up to make sure it works as 6 weeks on now going to be needed in 2 days at last.
Do private message thing and will set up dads if you want and work it out and say or ring if you want.
Did see it but thing was put away weeks ago and mine does not do as older year before model range.
Still 2Gb for 1 hour, not right. Done 1 hours download on computer of the iplayer program and is about 600Mb from memory so Hd wont be 2Gb I would think. Not what the above link web site says.