Any change to the composition of the Cabinet involving more than one appointment is customarily referred to as a reshuffle; a routine reshuffle normally occurs every summer. The total number of ministers allowed to be paid as "Cabinet ministers" is limited by the Ministerial and Other Salaries Act 1975, but there may be regular attendees at Cabinet who are not paid as Cabinet ministers. As of 1 March 2021, the number in addition to the prime minister is 22, total cabinet composition fluctuating between 21 and 23.