In May 1990, Vlok served on the government team, which held talks with the ANC delegation at Groote Schuur, Cape Town.
Ka Motsheganong wa 1990, Mandela o ne a etelelapele borongwa jwa ANC, jo bo neng jwa tshwara dipuisano le baemedi ba mmuso wa Afrika Borwa kwa Groote Schuur.