Recording in HD from Sky tv onto disc?

I'm presently recording some programmes from the hard drive on Sky tv through a scart connection but was wondering if I can get them in HD just for the sake of better quality. They're recorded on the tv HDMI2 in HD but didn't know if I could (or how to even) record them in HD onto the dvd recorder. I'm afraid I'm not very technical just took me a week figuring out how to do it with two scart leads. My tv has only 1 scart socket. I have my xbox connected to HDMI1 with an HDMI cable rather than scart if that means anything.