What are the best options for a one-way flight to South Africa?

Q. I am a lone passenger holding dual nationality and I'm looking for a one-way flight to Cape Town from a London airport. Travel agents are not forthcoming with regard to all the options available – which is almost the same cost as a return flight. I am not necessarily seeking a direct, non-stop flight, as cost is my main concern. In addition, I do not have the usual constraints associated with long haul and can travel at short notice from late June. Michael Black

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