yes mate
they do lnb's with 8 outputs now so you can really go to town if it works

but you need 2 lines comin in to the sky+ box, one to record what is being recorded and the other to watch something else
you can also record 2 different programs at the same time but you ned to be watching one

with sky HD you need a seperate set up so that won't work with the normal set up you've got

if the HD boxes come down to £99 i'll be getting one ins a hurry, at the moment they've gone back up to £250