Zimbabwe’s veteran president Robert Mugabe has tightened his vice-like grip on power as his ruling Zanu-PF party gears up for a critical conference next week. His vice-president Joice Mujuru has been sidelined amid allegations that she was plotting against him, and the party has amended its constitution to give him sole power to appoint a deputy - or de facto heir apparent. Many people think he is lining up his wife Grace for the role. Fiona Symon spoke to Andrew England about the country's murky politics.

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