If they could get access to JNB, then they would be on to the money. The demand for that route is massive. There are something like 24 x 744s a week between LHR and South Africa and the load factors are HIGH. Nationwide run out of LGW to JNB three times a week and, I hear, are planning a second machine on the route by the next high season (Dec/Jan) to take them to six rotations a week.
There is certainly room for more but getting the paperwork out of Pretoria (the capital city) will not be easy. SAA and ACSA the Airports Company of South Africa that runs all the main fields, are nationalised companies. But there is money on that route and the number of South Africans in this country, is enormous. I would suggest that LTN is a fabulous jumping off point to catch this market.