Is it male primogeniture, i.e. that titles and associated perks get inherited by a younger brother rather than by elder sisters? Charlotte Carew Pole, Director of Daughters' Rights, says it is, when she popped up on a thread earlier this week.
www.mumsnet.com/Talk/womens_rights/3536131-If-men-s-sex-based-rights-i-e-peerages-money-power-and-position-are-protected-by-the-GRA-why-can-t-women-s-be
Her lobbying group has a bill before Parliament this Friday, seeking to overturn the age-old pattern of male aristocratic inheritance. A few years ago the royal family line of succession was changed, so that William and Kate's eldest, no matter what sex, would be raised as heir.
What other legal anomalies remain, where male privilege is so entrenched in the law that perhaps we can't see it? I mean, who cares about Downton Abbey and peeresses with tiaras and ermine, but it's the principle of the thing and I get Campaigning Charlotte's point that it is about gradual change within the mechanisms that exist, in order to get more women into the House of Lords.