Knock-on effects included Ware moving back to Division One North after first being placed in the Southern League, and Hayes & Yeading United moving to the Southern Premier after initially being placed in the Isthmian Premier.
Margate won the play-offs and returned to the sixth tier after ten seasons in the Isthmian League.
Peacehaven & Telscombe missed out on a reprieve by one point from Marine who finished 21st in the Northern Premier League.
After Enfield Town were found guilty of fielding an ineligible player in two matches, they were deducted three points, resulting in Metropolitan Police moving into a play-off position.
Burnham Ramblers finished bottom of the table and were the only relegated club after Barkingside and Redbridge were reprieved.