The Salisbury Convention is an unwritten constitutional convention that the Commons, as the elected chamber, has a mandate to pass anything in manifesto without Lords veto. This was necessary as the Conservative Party had an absolute majority in the House of Lords, and it was seen as inappropriate for them to use this to block the Labour government's policies following their landslide victory in 1945. The Life Peerages Act 1958 enabled the appointment of a new class of peers, who could sit and vote in the House of Lords, but the honour and rights would not be hereditary. These were intended to be merit-based, letting in 'the great and the good' from various backgrounds of expertise and experience and ending the exclusively hereditary (and male dominated) composition. Since 1965, almost all peerages appointed have been life peerages. However, the system has come under criticism in 'cash for honours' scandals in which those who donate significant sums to political parties may be able to gain membership of the House of Lords, undermining its credibility as a revising chamber. The Peerage Act 1963 allowed hereditary peers to disclaim their peerage, allowing them to vote and stand for elections to the House of Commons. It also permitted hereditary peers in the Peerage of Scotland and female hereditary peers to sit in the House of Lords without the election of representative peers as had been the procedure in Scotland prior to the Act.