i don't know if i have misunderstood the technology but this is what i want:
I have a lcd tv with freeview built in.
I want to be able to record a channel and say watch another one for example. Like sky+ tbh.
Can i do that with out spending mega bucks?
You need a freeview recorder.
If it has a single tuner, you can record/pause one channel only. If you want to watch another channel, you can just watch it through your tv's tuner as you're doing now. Obviously, both tv and recorder need to be connected to the tv aerial.
A recorder with a twin tuner will allow you to record two channels/record one and pause one at the same time. Then you could watch another channel through your tv tuner.
With either, you can record 1/2 channels and playback an already recorded programme.
If you want HD channels, you'd need a freeview HD recorder (again the above about single/twin tuners applies) which as stated above have only recently come out. Freeview HD is not widely available yet and I think would require another aerial and/or repositioning to accept a decent HD signal. This link will tell you if you can receive it
http://freeview.co.uk/availability/main
If you're in a freeview HD area, then this would allow you to watch BBC, ITV & Channel 4 HD channels. Alternatively, freesat HD is available most places but only has BBC & ITV HD channels and would require a satellite dish/existing sky dish.
If you don't want HD, I'd personally get something like this
http://www.amazon.co.uk/dp/B001EBQGIO/?tag=cliospnet01-21
I've always read good things about Humax. But worth having a quick check on What Hi-Fi website for reviews of this and others when it's back up.
Humax say 160GB = up to 100 hours, 320GB = up to 200 hours and 500GB = 300 hours. I'm not sure if you can adjust the quality of recordings, but obviously higher quality means less hours of recording.