Are there to anyone's knowledge flights from London that one can stop off in Lusaka before continuing onto South Africa?
The only airline which flies direct to Lusaka from London is British Airways. From there SAA. There is no code share between BA and SAA.
It looks like South African Airlines has this option...How long of a layover do you desire in Lusaka?
About a week
EarlingBlue is correct - only BA flies direct London to Lusaka - South African would take you to JB first (with a quick connection) and to Lusaka.
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