Here are the prices from Virgin if you want to add SkySports channels:
Sky Sports & Movies channels
Sky Sports & Movies Collection
Get all 10 Sky Movies channels (everything in Sky Movies 1 & 2, below) plus 4 Sky Sports channels (1, 2, 3 and 4).
TV XL
Monthly
£29.50
Sky Sports Collection
Includes Sky Sports 1, Sky Sports 2, Sky Sports 3 and Sky Sports 4.
TV XL
Monthly
£22.50
Sky Sports 1
Selected football from the Barclays Premier League, plus Rugby Union, international cricket and golf.
TV XL
Monthly
£14.50
Sky Sports 2
More of the best sporting action - Barclays Premier League football and tons more.
TV XL
Monthly
£14.50
Sky Movies Collection
Get everything in Sky Movies 1 and Sky Movies 2, plus Sky Movies Premiere, Sky Movies Premiere +1, Sky Movies Showcase and Disney Cinemagic
TV XL
Monthly
£21.50
Sky Movies 1 pack
Includes Sky Movies Comedy, Sky Movies Family, Sky Movies Classics, Sky Movies Modern Greats, Sky Movies Drama and Romance
TV XL
Monthly
£14.50
Sky Movies 2 pack
Includes Sky Movies Comedy, Sky Movies Action and Adventure, Sky Movies Sci-fi and Horror, Sky Movies Crime and Thriller, Sky Movies Indie
TV XL
Monthly
£14.50
Get your Sky channels in HD
Watch your Sky channels in crystal clear HD. This is only available with a Sky channel pack above. Sky Sports 3 & 4, Sky Premier +1, Sky Movies Classics and Disney Cinemagic are not available in HD.
Monthly
£7.00
So the best case, is that Sky always keep the F1 on the same channel (rather than switching it which I think they will do) which would cost me £14.50 + £7.00 per month. I would want it in HD hence the £7 extra.
So that comes to an extra £21.50 per month minimum.
It could in fact be that you require the "Sky sports collection" at £22.50 + £7.00 per month = £29.50 extra per month for me.
The above assumes no further discounts, so it might be that you can get money off to do with other deals/packages you have, but in my experience they don't tend to budge much on adding premium content like Sky.
Completely out of the question for me financially. I already pay them £65 per month for an acceptable BB service (too much ocntention in my area on anything below 50mb), TV and phone.