This guide explains how to renew a South African passport in the United Kingdom. It includes timelines based on my experience and I advise that take them as guidance not gospel.
It concentrates on the option of renewing and picking up renewed passports at the VFS Global South African Passport Application Centres in London, Edinburgh, and Manchester. Passport services include passport renewal, child passport application, and adult passport application.
It cost £107.50 to renew your passport.