In the past, the lowest Openreach Service Maintenance Level for LLU lines was one level higher than the lowest Service Maintenance Level available for WLR3. So if everyone was taking the cheapest and slowest option, LLU lines had better service. More recently, Openreach made the lowest service level, previously only available for WLR3, also available to LLU lines. If LLU providers downgraded their lines to the lowest service level, then it's possible Openreach now have plenty of spare resources for someone to take a higher service level.