This is the upper chamber but the one with less authority. Its main roles are to revise legislation and keep a check on Government by scrutinising its activities. Since 1911, its power to block "money bills" is limited to one month and its power to block other bills is limited to one session, so ultimately it cannot block the will of the House of Commons.
The House of Lords is an utterly bizarre institution that has no parallel anywhere in the democratic world. Indeed the only other country with an unelected second chamber is Lesotho. The explanation for the unusual nature of the Lords goes back to the beginning of this essay: the British political system has evolved very slowly and peacefully and it is not totally logical or democratic.
There is no fixed number of members in the House of Lords, but currently there are 774 members - many more than in the House of Commons, more than the combined houses of the American Congress or the Indian Parliament (although both of these nations have a federal system), and the second biggest legislative body in the world (after the Chinese National People's Congress which is effectively a rubber-stamping body). The number was actually halved to 666 in the reforms of 1999 but, since then, succesive Prime Ministers have been adding new life peers much faster than members are dying. Indeed the current Government has added over 100. Ironically the size of the House of Lords continues to rise at the same time as the House of Commons has legislated to reduce its size.
Historically most members of the House of Lords have been what we called hereditary peers. This meant that years ago a king or queen nominated a member of the aristocracy to be a member of the House and, since then, the right to sit in the House has passed through the family from generation to generation. Clearly this is totally undemocratic and the last Labour Government abolished the right of all but 92 of these hereditary peers to sit in the House.
Almost all the other members of today's House of Lords are what we call life peers. This means that they have been chosen by the Queen, on the advice of the Government, to sit in the House for as long as they live, but afterwards no member of their family has the right to sit in the House. Almost 200 are former Members of Parliament. Others are distinguished figures in fields such as education, health and social policy.
A small number of other members - 26 - are Archbishops and Bishops of the Church of England. Iran is the only other country in the world that provides automatic seats for senior religious figures in its legislature.
At the last count (1999), two-thirds of peers were aged over 65 and 15% were aged over 80. There is no retirement age.
There is nowhere near sufficient seating capacity in the chamber of the House of Lords for all the peers. Members do not sit at desks (like most legislatures) but on long, red-covered benches and there is only seating capacity for 230 peers out of the total of 774. Even on a 'whipped' vote, a couple of hundred peers will not turn up.
House of Lords reform is unfinished business. The Parliament Act of 1911 first raised the prospect of an elected upper house but it has still not happened. There is a cross-party consensus that it should become a mainly elected body, although there is as yet no agreement on the details of the next stage of reform.