This timeline details Leaders of Plaid Cymru
See also: Leaders of the Conservative Party UK
Leaders of the Labour Party UK
See also: Leaders of the Conservative Party UK
Leaders of the Labour Party UK
See also: Leaders of the Conservative Party UK
Leaders of the Labour Party UK
See also: Leaders of the Conservative Party UK
Leaders of the Labour Party UK
See also: Leaders of the Labour Party UK
Leaders of the Liberal Democrats UK
See also: Leaders of the Conservative Party UK
Leaders of the Liberal Democrats UK