a long as you have enough ports on your lnb you can run both together, as you have sky plus and that uses two feeds, you would need another feed for your freesat other wise you will have to keep swapping cables, normally when sky fit sky+ or hd they fit a quad lnb so you should have spare ports on the lnb as your currently using two,but if they didn't and only fitted a dual lnb you would need to change it for one with four,six(rare) or 8 ports