A total of 22 people have been excluded in that time, although the identities of six of them have been withheld by the government in the "public interest". The named individuals are:

ABDULLAH QADRI AL AHDAL Preacher. Considered to be engaging in unacceptable behaviour by seeking to foment, justify or glorify terrorist violence in furtherance of particular beliefs and fostering hatred that might lead to inter-community violence.

YUNIS AL ASTAL Preacher and Hamas MP. Considered to be engaging in unacceptable behaviour by seeking to foment, justify or glorify terrorist violence in furtherance of particular beliefs and to provoke others to terrorist acts.

STEPHEN DONALD BLACK Former Ku Klux Klan grand wizard who set up racist website Stormfront. Considered to be engaging in unacceptable behaviour by promoting serious criminal activity and fostering hatred that might lead to inter-community violence in the UK.

WADGY ABD EL HAMIED MOHAMED GHONEIM A prolific speaker and writer. Considered to be engaging in unacceptable behaviour by seeking to foment, justify or glory terrorist violence in furtherance of particular beliefs and to provoke others to commit terrorist acts.

ERIC GLIEBE Neo-Nazi. Has made web-radio broadcasts in which he vilifies certain ethnic groups and encourages the download and distribution of provocative racist leaflets and posters. Considered to be engaging in unacceptable behaviour by justifying terrorist violence, provoking others to commit serious crime and fostering racial hatred.

MIKE GUZOVSKY Jewish militant. Leader of a violent group and actively involved with military training camps. Considered to be engaging in unacceptable behaviour by seeking to foment, justify or glorify terrorist violence in furtherance of particular beliefs and to provoke others to terrorist acts.

SAFWAT HIJAZI Television preacher. Considered to be engaging in unacceptable behaviour by glorifying terrorist violence.

NASR JAVED Kashmiri militant group leader. Considered to be engaging in unacceptable behaviour by seeking to foment, justify or glorify terrorist violence in furtherance of particular beliefs.

ABDUL ALI MUSA Muslim activist, previously known as Clarence Reams. Considered to be engaging in unacceptable behaviour by fomenting and glorifying terrorist violence in furtherance of his particular beliefs and seeking to provoke others to terrorist acts.

FRED WALDRON PHELPS SNR & SHIRLEY PHELPS-ROPER American pastor and leading spokesman of Westboro Baptist Church. Considered to be engaging in unacceptable behaviour by fostering hatred that might lead to inter-community violence in the UK. The 79-year-old and his daughter are barred for their anti-gay comments. Both have picketed the funerals of Aids victims and have claimed the deaths of American soldiers are a punishment for US tolerance of homosexuality.

SAMIR AL QUNTAR Hezbollah militant. Spent three decades in prison for killing four soldiers and a four-year-old girl. Considered to be engaging in unacceptable behaviour by seeking to foment, justify or glorify terrorist violence in furtherance of particular beliefs and to provoke others to terrorist acts.

ARTUR RYNO & RAVEL SKACHEVSKY Leaders of a violent Russian skinhead gang that beat migrants and posted films of their attacks on the internet, and committed 20 racially motivated murders. Considered to be engaging in unacceptable behaviour by fomenting serious criminal activity and seeking to provoke others to serious criminal acts. Both are currently in prison.

AMIR SIDDIQUE Preacher. Considered to be engaging in unacceptable behaviour by fomenting terrorist violence in furtherance of particular beliefs.

MICHAEL ALAN WEINER (ALSO KNOWN AS MICHAEL SAVAGE) Controversial daily radio talk-show host. Considered to be engaging in unacceptable behaviour by seeking to provoke others to serious criminal acts and fostering hatred which might lead to inter-community violence. His views on immigration, Islam, rape and autism have caused great offence in the US.

"This is someone who has fallen into the category of fomenting hatred, of such extreme views and expressing them in such a way that it is actually likely to cause inter-community tension or even violence if that person were allowed into the country," UK Home Office Representative Ms Smith told BBC Breakfast.

"If people have so clearly overstepped the mark in terms of the way not just that they are talking but the sort of attitudes that they are expressing to the extent that we think that this is likely to cause or have the potential to cause violence or inter-community tension in this country, then actually I think the right thing is not to let them into the country in the first place. Not to open the stable door then try to close it later," Ms Smith said.

"It's a privilege to come to this country. There are certain behaviours that mean you forfeit that privilege."