Which year did all women over 21 get to vote in Britain?

All women over the age of 21 gained the right to vote in Britain in 1928. This change was part of the Representation of the People Act, which extended voting rights to women on the same terms as men. Prior to this, women had gained limited voting rights in 1918, but those were restricted to women over 30. The 1928 act marked a significant step towards gender equality in the electoral process.