the power of good old google
http://shop.virginmedia.com/digital-tv/channels.html
http://tv.sky.com/tv-guide
all the channels you listed are on virginmedia.i would imagine if you swapped over to virgin media,then the saving you would make by including your living room tv into your VM bundle.then that would out-weigh being with sky..
rem this is just my opinion.sorry i cant tell you how much this would be as you already have virgin media..