I don't think it will break until someone else from outside South Yorkshire get us promoted (last 4 I think?)
Yep, you have to go back to 1990 for a promotion not overseen by someone from an "S" postcode.
2023: CH>PL Paul Heckingbottom (Barnsley)
2019: CH>PL Chris Wilder (Sheffield)
2017: L1>CH Chris Wilder (Sheffield)
2006: CH>PL Neil Warnock (Sheffield)
1990: D2>D1 Dave Bassett (London)
1989: D3>D2 Dave Bassett (London)
What the flatearthers don't realise is that all our relegations in the last 30 years have also come under Yorkshiremen
2024: PL>CH Chris Wilder (Sheffield)
2021: PL>CH Chris Wilder* (Sheffield) / Paul Heckingbottom (Barnsley)
2011: CH>L1 Mickey Adams (Sheffield)
2007: PL>CH Neil Warnock (Sheffield)
1994: PL>D1 Dave Bassett (London)
*while Heckingbottom was in charge when we were confirmed relegated, he only had 9 games as interim manager and we were bottom on 14 points from 29 games when he took over. That relegation was 90% on Wilder.