With an average temperature of 6C, the Met Office has confirmed this year's spring was the fifth coldest since national records began in 1910, and the coldest since 1962.
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Mnangagwa’s elevation comes amid news that ZANU-PF, the ruling party, has promised not to prosecute their former leader.
Some snow has fallen over parts of Scotland, northern England and Northern Ireland.
The treatment uses cancer-killing immune cells taken from donor blood, which are multiplied in the lab.