Dutch MP Geert Wilders, who is being prosecuted at home for anti-Islam remarks, was turned away from Britain on Thursday after he attempted to dey a government ban on entering the country.
Mr Wilders wanted to show his film Fitna, which argues that the Koran incites violence, in the British parliament.
He was told by British authorities on Tuesday that he was being excluded, but took a flight to London.
Britain's Home Office said he would not be allowed entry into Britain, but gave no other details.
The exclusion caused a diplomatic spat between the Netherlands and Britain.
Dutch Foreign Minister Maxime Verhagen phoned his British counterpart David Miliband to "express his displeasure" that a Dutch member of parliament had been excluded.
Mr Miliband said the "hate-filled film" was designed to stir up religious and racial hatred in Britain, contrary to its laws.
The Netherlands has condemned the film, which was aired over the internet last March, saying it served no other purpose than causing offence.
An Amsterdam court has ordered Wilders' prosecution for inciting hatred and discrimination based on comments in various media on Muslims and their beliefs.
