The Board of Trustees currently comprises 14 Trustees.
The President and Chairman of the Board of Management are ex-officio but non-voting Trustees.
The elected Trustees serve for up to two four-year terms, with elections being held on a biennial rotating basis. The next election year is 2018.
Elected Trustees take up office from 1 January in the year following their election. The maximum continuous period a Trustee can serve for is 8 years, after which they must wait at least two years before standing for re-election.
The Board of Trustees elect a Chairman of the Board and an Honorary Treasurer on an annual basis.
The elected members of the Board of Trustees are trustees for the membership as a whole (i.e. not regionally representational) and are not permitted to hold any other office nor take up any other appointment within the Institute, while serving as a Trustee.
The Board of Trustees meet twice a year (Spring and Autumn), and every alternate year the Board of Trustees Autumn meeting coincides with the holding of Congress.