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But the last 10 days have seen the pair move from gentle disagreement to bitter acrimony.

South Africa's President Cyril Ramaphosa and his delegation went to Washington this week hoping for a boost and a reset after months of acrimony with the Donald Trump administration.

In the years leading up to the incident, his life was touched by family acrimony and a keen interest in explosives.

Graeme Sharp, back in the fold after a period in exile when his spell on the board ended in acrimony, attended too.

Neither side directly responded to the allegations but both lamented that the acrimony had escalated to litigation.