Hi trev, ill help to the best of my ability.
Since you have a satelite dish, you may be able to get away with using a free sat receiver instead of a Sky receiver. Free sat is free, so you'd only need to pay for the box which i dont think is expensive (i don't know how much they cost) Im sure they're compatible though.
There are plenty of SIM only deals you could look for, or if you are looking for a land line also, Virgin may also be able to sort you out a deal for a land line phone with an offer regarding a mobile contract... if you give them a ring they will be able to talk you through your options... this could also include broadband internet, so it would probably be best to get all three on some sort of package if it's available ( someone in the know could confirm this if they read the topic)
Basic TV would be provided through your already installed sat dish, and a free sat receiver (you must double check to make sure they are both compatible, although im sure they are) With it being digital, you'll get a much better quality picture than the analogue... as an alternative, Virgin also supply the "M" package TV for free to people who take broadband and a telephone line i believe.
I'm not sure how much it would cost, my guess for an all inclusive virgin package containing a phone line, a mobile contract (cheap) and internet is around £45, whichj includes "M" tv as standard.
Like i say though, hang around and someone who works for Virgin or is more in the know will confirm what options you have, alternatively dont hesitate to ring them up
IT also depends on whether your cottage is wired to receive digital services through the Virgin network.