Hi - I read about a sky sports extra pass that included BT Sports but can't see an option to purchase one? Does it not exist?
There is no such NowTV Sports pass, where if you want to watch BT Sports you need to pay BT directly via their non contract BT Sports Service.
More information here in these two links.
The Sky Sports extra pass is only available in Ireland. Here in the U.K. you have to get a BT sport contract or month pass as @schnapps has indicated.
Where i totally forgot about the NowTV Republic of Ireland service.