In response to Harry Benson: The ‘burning injustice’, Mrs May, is that the poor no longer wed, JohnB wrote:

Marriage is now hugely disincentivised by the state. You get more benefits being unmarried (far more than Cameron’s laughable Marriage Allowance), men probably face fewer risks of having everything taken from them in a family court if they’re unmarried and unconnected to their children, women are married to the state.

But it should be the other way round. The economics of being an unmarried mother should be extremely challenging to make it unattractive. Married couples should be able to share their tax allowances to make marriage economically favourable. Right now, only the relatively well-off can afford to be married, which might explain the huge imbalance.