912. Power to commit to prison or take into custody.

Each House of Parliament historically has a theoretical power to commit to prison persons (including its own members) who offend against the privileges of the House concerned or who are considered to be in contempt1. However, in practice the last time such a power was exercised was in 1880 by the House of Commons, and it seems that the exercise of such a power has fallen into disuse and could not be revived without legislation2.

In former times offenders could be detained either in prison, or in the custody of Black Rod3 or the Serjeant at Arms4, as the case