The far-right Dutch politician Geert Wilders intends to travel to London next week after an immigration tribunal ruling overturned a ban on visiting Britain.
The Home Office said it was disappointed after the tribunal rejected its claim that his presence could "inflame community tensions and lead to inter-faith violence".
The Freedom party leader immediately announced his intention to meet Ukip's Lord Pearson of Rannoch to discuss a showing of his anti-Islamic film Fitna later this month in the House of Lords.
Judge CMG Ockelton, who chaired the tribunal, said that Wilders's opinions were expressed strongly and in a way that was bound to cause offence but that the right of freedom of expression was important in a democratic society.
London got it right, a free society only stays free by allowing free speech. It is of no import that Mr Wilders is Islamophoic jerk. He has a right to speak his ill-informed and bigoted opinion.