Don't know about Scottish groups there, but think it very likely since a majority of original settlers were Scots.

This from the Clan Graham website:
James Angus Graham, b. 1907, was the 7th Duke of Montrose and was also Earl of Kincardine; Viscount Dunduff, Lord Graham; Aberuthven; Mugdock and Fintry. He became a farmer in Rhodesia (now Zimbabwe) and was a cabinet minister in the Rhodesian Government of Ian Smith. He moved to South Africa and later returned to Scotland before his death in 1992.
Brian