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Lord Aberdare has been elected as a Crossbench hereditary Peer in the recent by-election to fill the vacancy after Viscount Bledisloe's death on 12 May 2009.
Under the House of Lords Act 1999, the House of Lords elected 90 hereditary Peers to sit in the reformed House. When one of these hereditary Peers dies, a by-election is held in which excepted hereditary Peers are entitled to vote.
All those on the Register of Hereditary Peers are eligible to stand in by-elections. The by-election must take place within three months of any vacancy occurring.
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