If timing is everything, then Allison Kirkby may have judged it perfectly.

Since becoming BT’s first female chief executive more than two years ago the company’s share price has climbed 80%, an investor-pleasing turnaround that has seen Kirkby well-rewarded with a pay and bonus package of £5.6m last year, the largest for a boss of the telecoms company in well over a decade. However, there are questions over how much credit Kirkby can take for the apparent revival of the business.