An amnesty for illegal immigrants living in Britain would add £3bn a year to gross domestic product and generate annual tax revenues of almost £850m, according to a London School of Economics report commissioned by Boris Johnson, London mayor.
The findings will cause further discomfort for the Tory high command, whose policy of opposing an amnesty is at odds with that of the party’s most senior governing official. Mr Johnson has been campaigning on the issue for more than a year.
