The BBC doesn't show have any domestic sports leagues, period. It's a public broadcaster so funded by taxpayer money and they can't throw away hundreds of millions of that bidding against commercial TV networks for the rights to televise domestic sports leagues. The Challenge Cup, soccer's FA Cup and some international sports such as the Olympics are on there because they are constitutionally protected events deemed to be of national importance which have to be shown on the terrestrial broadcaster by law. Not sure what the arrangement is for the RL internationals that they show but either way, the BBC aren't ever going to show live SL matches, if SL was on FTA it would need to be on one of the other networks of which none have ever shown any interest in bidding for that sort of thing. The reality is that SL will either need to be on Sky or BT Sport for the foreseeable future as they are the only networks which would offer enough money to sustain the comp. One thing that would be a good idea IMO would be offering Championship/League 1 coverage to a smaller FTA network that could offer it primetime coverage, at the moment it's bundled in with the SL Sky deal but apart from weekly Toronto matches and the Summer Bash they aren't showing any of it.