If a Hereditary Peer retires / dies, then what happens next? -What do Critics say?

-The Chamber has a By-election among the remaining Hereditary Peers from their respective Political Party. They chose from the wide range of Peers (that used to sit in the Lord but then Removed) to fill the Vacancy. -Critics note out the Hypocrisy of the Hereditary Peers - Undemocratic - being maintained via an Election. (Democratic Deficit)