The procedure for impeachment was described in the first edition of
Erskine May thus: any member of the
House of Commons with proof of an individual's crimes could charge them of said crime and move for their impeachment. If the House of Commons voted to impeach, the mover would be ordered to go to the Bar of the
House of Lords to impeach them "in the name of the House of Commons, and of all the commons of the United Kingdom" and "to acquaint them that this house will, in due time, exhibit particular articles against him, and make good the same." In practice, the Commons would usually select a committee to draw up the charges and create an "Article of Impeachment" for each. Once the committee had delivered the articles to the Lords, replies go between the accused and the Commons via the Lords. If the Commons have impeached a peer, the Lords take custody of the accused; otherwise,
Black Rod takes custody. The accused remains in custody unless the Lords allow bail. The Lords set a date for the trial while the Commons appoints
managers, who act as prosecutors in the trial. The accused may defend by counsel. The House of Lords hears the case. The procedure used to be that the
Lord Chancellor presided (or the
Lord High Steward if the defendant was a
peer); but this was when the Lord Chancellor was both the Lords' presiding officer and head of the judiciary of England and Wales. Since both these roles were removed from that office by the
Constitutional Reform Act 2005, which created the
Lord Speaker of the House of Lords to preside over the Lords and made the
Lord Chief Justice head of the judiciary, it is not certain who would preside over an impeachment trial today. If parliament is not in session, then the trial is conducted by a "Court of the Lord High Steward" instead of the House of Lords (even if the defendant is not a peer). The differences between this court and the House of Lords are that in the House all of the peers are judges of both law and fact, whereas in the Court, the Lord High Steward is the sole judge of law and the peers decide the facts only; and the
Bishops are not entitled to sit and vote in the Court. Traditionally, peers would wear their parliamentary robes during the hearings. The hearing resembles an ordinary trial: both sides may call witnesses and present evidence. At the end of the hearing the lords vote on the verdict, which is decided by a simple majority, one charge at a time. Upon being called, a peer must rise and declare "guilty, upon my honour" or "not guilty, upon my honour". After voting on all of the articles has taken place, and if the Lords find the defendant guilty, the Commons may move for judgment; the Lords may not declare the punishment until the Commons have so moved. The Lords may then decide whatever punishment they find fit, within the law. A royal
pardon cannot excuse the defendant from trial, but a pardon may reprieve a convicted defendant. However, a pardon cannot override a decision to remove the defendant from the public office they hold. == Legal basis ==