Question: Which championship where Steve Agnew was relegated, is the second highest overall championship in the English football league system?
Sentence (from "List of Hayes &amp; Yeading United F.C. seasons"): For the 2015–16 season the division was renamed National League South; in the same season Hayes & Yeading finished in 21st place and were relegated for the first time to level 7 in the English football league system currently competing in the Southern Football League.
Relevant evidence: No