For me, the lack of appointments for Jones and England suggests to me a better promotion system would have a small step between SG1 and 2. Perhaps a supplementary panel that could referee up to 5 games per season in the prem and then can transition seamlessly to the SG1 list when a space becomes available.
Germany uses that exact promotion system. A small group of 2. Bundesliga referees can do up to 5 Bundesliga matches per season. At the end of the season they are evaluated before a possible promotion.