TOPSHOT - Britain's Prime Minister Theresa May (C) is greeted by schoolchildren waving British and South African flags, during a visit to the ID Mkhize Secondary School in Gugulethu township, about 15 km from the centre of Cape Town, on August 28, 2018, as part of a three-nation visit to Africa in Cape Town where she is expected to discuss post-Brexit trade ties with the continent's most developed economy. (Photo by Rodger BOSCH / POOL / AFP)        (Photo credit should read RODGER BOSCH/AFP/Getty Images)
British Prime Minister Theresa May leave after addressing business leaders at the offices of the First National Bank in Cape Town, on August 28, 2018, as part as part of a three-day, three-nation visit to Africa focused on post-Brexit trade ties. (Photo by NIC BOTHMA / POOL / AFP)        (Photo credit should read NIC BOTHMA/AFP/Getty Images)
Britain's Prime Minister Theresa May (L) is greeted by schoolchildren waving British and South African flags, during a visit to the ID Mkhize Secondary School in Gugulethu township, about 15 km from the centre of Cape Town, on August 28, 2018, as part of a three-nation visit to Africa in Cape Town where she is expected to discuss post-Brexit trade ties with the continent's most developed economy. (Photo by Rodger BOSCH / POOL / AFP)        (Photo credit should read RODGER BOSCH/AFP/Getty Images)
British Prime Minister Theresa May addresses business leaders at the offices of the First National Bank in Cape Town, on August 28, 2018, as part as part of a three-day, three-nation visit to Africa focused on post-Brexit trade ties. (Photo by NIC BOTHMA / POOL / AFP)        (Photo credit should read NIC BOTHMA/AFP/Getty Images)
Britain's Prime Minister Theresa May poses with school children during a visit to the ID Mkhize Secondary School in Gugulethu, about 15km from the centre of Cape Town, as part of a working visit to South Africa, on August 28, 2018. (Photo by Rodger BOSCH / POOL / AFP)        (Photo credit should read RODGER BOSCH/AFP/Getty Images)