A lot more information about the rejection of Nicholas Henderson’s election is found today in a report by Pat Ashworth in the Church Times: Elected bishop is vetoed as ‘unsound’, for example:
The decision was not conveyed to Mr Henderson until he phoned the Provincial Secretary. He discovered that he had been rejected by a majority vote by the bishops of Zimbabwe, Botswana, Zambia, and Malawi. Five bishops are known to have supported Mr Henderson, who has had no contact with Archbishop Malango, despite repeated phone calls over five days.
The CEN has this report by George Conger: London vicar rebuffed as bishop in Central Africa.