Apart from England all live rights for all home nations outside of major championships are with Sky Sports.
Are you sure about that? Wales are on C4 after many years on BBC, Ireland are on C4, Scotland are BBC/BT shared, England are on Sky with BBC having highlights. This is the November internationals.
The summer tours are generally on Sky by virtue of them having the Sanzar rights.
In other news - the 6-Nations committee have agreed to unify the TV rights:
...which also means the RFU have have handed control of their lucrative Sky deal to the 6N. I'm surprised and not surprised.