She laughs: “Yeah a lot of guys say, ‘I want a smart girl’ but then when you drill down it’s like, ‘do you want an equal partner or do you actually want a supporting housewife?

’” Sheryl Sandberg, Facebook’s chief operating officer, recently advised women to handle this deal-breaker by asking potential partners whether they would support their career.

“Marriage is no longer a no-brainer,” says Bradford. Last November she froze her eggs to silence her biological clock and thus avoid making a bad dating decision because of the right timing.

Data for London alone show the top three occupations among accepted members are chief executive, consultant and analyst; some 13 per cent have an MBA.

Although users do not have to pay, they do have to be screened.

A computer science graduate and former Google employee, she was doing an MBA at Stanford University in California and freshly single after a five-year relationship when the age of Tinder and other such online dating apps dawned. Her disappointment with them spurred her to start her own.

Unlike other apps, which, she complains, lacked “enough required information“, hers would have a screening algorithm that assesses users’ ambition and intelligence by integrating with their Linked In and Facebook profiles.

By last month, of the 9,205 applicants to the London League, only 2,000 (21 per cent) had been accepted.

When I meet Bradford in a café in Chelsea, I find a friendly American, wearing no make-up, at a laptop.

Only those whose profiles match the app’s scrupulous criteria are accepted (though the vetting process itself is somewhat shrouded in mystery).

Once in, users can select their dating preferences — gender, height, age, even religion — and are then allocated a rep from the app to act as their guide and matchmaker.

Ambition and success will only get you to the door, it’s wanting the same for your partner that will get you in.

“I want men on the app who really are looking for strong, opinionated, successful women,” says Bradford.

It’s a much more efficient way to meet people.” She describes herself as a “social networking fiend” from a young age, who moved around as a child and so had to become good at making new friends. But one can hardly blame her for her seriousness on the subject: the world of elite dating apps is growing and, one assumes, becoming increasingly competitive.