HDMI lead worthwhile?

I am about to take delivery of a new LCD TV, purchased with HD(Freeview) in mind when it comes online here in April.
I have a Black Vision box, which has an HDMI connection. Will there be anything gained at all by connecting the box via HDMI to the TV? Is there some kind of ' upscaling' which will improve SD to be shown at HD resolution or will this only work with eg a Blu Ray or DVD player?
Thanks

100% get it conneced with HDMI.
Buy cheap though don't be conned by a fancy price.
It is hard to be honest to tell the difference between a programme filmed in HD like Corrie upscaled via HDMI and watching it on the actual HD channel.
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HDMI lead worthwhile?

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