Fergie came up short with one record

My own disappointment at the resignation of Sir Alex Ferguson as manager of Manchester United derives from two related points.

First, there is one particular record he alone could have, but did not, achieve.

Second, precisely because there was such an avalanche of comment all over the place about him, I cannot find any answer to this question. Maybe your newspaper has readers who are both Man U fans and statisticians, who could clarify things here.