in 1965 constantine became a founding member of the sports council, which aimed to develop sport in britain. two years later, he was appointed to the three-person race relations board, formed through the race relations act, to investigate cases of racial discrimination. in this role he spoke out against the commonwealth immigrants act, a stance that led to an offer from the liberal party, which he declined, to stand as parliamentary candidate for nelson. later, he was involved in an unsuccessful attempt to negotiate the release, after a military coup, of abubakar tafawa balewa, the overthrown prime minister of nigeria. constantine was appointed to the bbc's general advisory committee in 1966 and became a bbc governor two years later, although declining health restricted his involvement. the following year the students of st andrews university elected constantine as rector, but again his health prevented him performing effectively in this role. in his last years, constantine was criticised for becoming part of the establishment; "private eye" mocked him, while the new generation of west indian immigrants believed he was out of touch. more radical black spokesmen disapproved of his conciliatory approach to racist incidents.