Now it makes sense

Thanks to a contributor in the Comments section of Biased-BBC Victoria Derbyshire's position at BBC 5Live makes sense. Wikipedia records that:

"Derbyshire became embroiled in a tabloid scandal in 2003 after becoming romantically involved with Mark Sandell, then partner of fellow Five Live presenter Fi Glover. She now lives with Sandell and their two sons."

Mark Sandell is described by the BBC as:

"an average reporter, a pretty poor presenter before becoming a brilliant and charismatic editor. Mark formerly edited the World Today on World Service Radio and before that was in charge of news programmes on Radio 5 Live and Radio 1 for the BBC"

So it seems to be the case that Victoria Derbyshire (VD) enticed Fi Glover's husband to her, then Fi Glover left 5Live and VD was rewarded with the 9-12 morning show. If this is not the correct sequence of events then I will be happy to alter my article...