FreeSat HD (UK)

Evening folks
I'm currently helping my old man to install a FreeSat HD system in his house as standard TV has bugger all reception here
Currently we can record on our Freeview box and what another channel at the same time
We would like a similar system with Freesat but with a slight twist

We currently have a NAS box that we recorded CCTV onto but now, as we live in a quieter area, don't need as much. Is there a Freesat system that would allow us to watch TV on one channel while recording over the network onto the NAS box over the network so we can watch them on PC's or the TV, and even play films stored on the NAS box. the NAS box is a Diskstation 211j so its a pretty good one with a 1TB hdd in it.