The House of Lords is a legislative chamber that is part of the Parliament of the United Kingdom. Although they are part of the parliament, its members are referred to as peers, more formally as "Lords of Parliament", not MPs. Lords Temporal sit for life, Lords Spiritual while they occupy their ecclesiastical positions. Hereditary peers may no longer pass on a seat in the House of Lords to their heir automatically. The 92 who remain have been elected from among their own number, following the House of Lords Act 1999 and are the only elected members of the Lords.