Most points in old Div 2 and Championship combined; Barnsley Football Club. Table in Birmingham Mail on News Now site. Sorry don't know how to link
https://www.worldfootball.net/alltime_table/eng-championship/ We've won more matches at that level than anyone else. We've also drawn and lost more than anyone else at that level, as well as scoring and conceding more. We are THE record holders at second tier level.
I allus thought Sunderland were our closest rivals for the record. Every day is a schoolday as I allus say.
What I find most interesting about that, is that Burton Albion are only the 4th most successful team from Burton.
It's a history I knew nothing about. They merged to form Burton United, who later merged with Burton All Saints to become Burton Town. They never reformed after the 2nd World War, and were absorbed by a new team, Burton Albion, in 1950. Fascinating.