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If both parents aren't travelling with a youngster, more documents will have to be shown at South Africa's ports of entry. Visas offer immigration officers with the required info to ensure applicants are admitted for the appropriate purpose and period into the Republic of South Africa. Visitors with tourist visas aren't permitted to take part in any employment (such as voluntary work) while in Mozambique. No prior clearance is needed. If you are in possession of a South African passport and you would like to go to the United Kingdom to find friends or family, watch sport or simply for a holiday, you'll need to submit an application for a visa. So, nope, you are unable to apply earlier than 4 weeks ahead of your flight.
Date: 09/02/2020