Belfast Old Instonians Association, also known as BOIA. The school has had a number of distinguished alumni who have gone on to achieve great success in various fields. The Presidents of the Old Instonians Association, which represents the school’s alumni. From 1943 to the present day, the Old Instonians Association has had a total of 22 Presidents, each of whom has made a unique contribution to the organisation. Over the years, the Presidents have worked tirelessly to promote the interests of the alumni and to support the school in various ways.