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With a line-up that includes Drew Barrymore, David Beckham, Orlando Bloom, and Ricky Martin, the UN's choice of ambassadors has been known to cause raised eyebrows or the odd smirk.

Seldom, however, has there been such anger, or questioning of the organisation's credibility, as that greeting the appointment of a new international envoy for tourism: Robert Mugabe.

Improbable as it seems, the Zimbabwean president, who is widely accused of ethnic cleansing, rigging elections, terrorising opposition, controlling media and presiding over a collapsed economy, has been endorsed as a champion of efforts to boost global holidaymaking.

Despite that fact Mugabe, 88, is under a travel ban, he has been honoured as a "leader for tourism" by the UN's World Tourism Organisation, along with his political ally, Zambian president Michael Sata, 75.

I'd like to see their list of criteria for choosing envoys for tourism. Perhaps Syria's al-Assad is on next year's list.