The RCS is largely funded through membership fees to the club. An expanded PA programme is promoting the club's role as a venue for
debate and influence.
The RCS promotes the Commonwealth's economic, political and human rights benefits for member nations. It lobbies on a raft of issues such as Aids and poverty.
Giljam, who will be based in London, said: 'My main challenge is to ensure the centre is not just a venue for business and social functions, but is used to promote the Commonwealth's values, such as multiculturalism.'
He added that meetings at the London club would be 'catalysts for further research, publications and policy development'.
Giljam will also visit schools and partake in community work.
He was director of comms for the Anglican Church in the Diocese of Cape Town for five years.
Giljam replaces Aime Sangara, who left the RCS to live in the Democratic Republic of Congo. He leads a four-strong team .