@captain wrong 9 pages to go, don't say I don't try and help you out.
Anyhow, I've been thinking about this closed shop stuff, and remembered decades ago the EFL use to run a closed shop itself, because it would vote on whether a team from the National League could be promoted in place of a relegation from Division 4 (L2).
It was very rare for a team from the non league to be voted in to be promoted. The last one relegated under that format was Workington being replaced by Wimbledon.
Good job I remember this ****te...
https://en.wikipedia.org/wiki/Workington_A.F.C.
In 1974 and 1975 the club finished second from bottom, and in 1976 they finished bottom, but at the end of each season they achieved just enough votes from fellow League clubs to retain their Football League status.
[2] However, in 1977 the club won only four games all season, and again finished bottom of the league, with home attendances falling well below the 1,000-mark. This poor run finally led to the club to be voted out of the League in summer 1977, being replaced by
Wimbledon.
[28][29] Workington were the penultimate team to fail the re-election process before it was scrapped in 1986 and replaced with automatic relegation to the
conference National;
Southport, who were voted out the season after Workington, were the last club to lose their Football League status this way.
Correction; Southport were the last relegated under the old format.