Men have to pay the majority of the taxes (men: 77B£/year women: 39B£/year) but benefit the least from these taxes especially since they die 7 years earlier than women.
Married men are especially discriminated against compared to lone parents. For every level of earnings a lone-parent with children has more left in her pocket than a married man with the same number of children who has to support one extra adult (P. Morgan: Farewell to the Family). This is because lone parents have earnings disregards and extra benefits.
Personal allowances can be transferred from the husband to the wife, but they can not be transferred from the wife to the husband.