But this legacy, which is championed primarily by earnest foreigners and white South Africans, is not the only one.

WSJ: The Real Legacy of Nelson Mandela

Nor is this simply because migrants favour migrants: even British-born white Londoners are friendlier to foreigners than other Britons.

ECONOMIST: London

Now, with the arrival of a million white, mainly poor, foreigners, immigration is being analysed in more purely economic terms.

ECONOMIST: Immigration trends