Answer: More than you would think.
The imam of the Grand Mosque of Mecca, Abdur Rahman as-Sudais is currently on a tour of Britain. He is known as the man who leads prayers observed by two million followers during the time of the Hajj pilgramage. Al-Sudais’ repurposes allegorical references to the Jewish tribes of Mecca from the Quran and converts them into supercilious anti-semitic hate sermons for the consumption of his followers.
Here is an example from the al-Haramain Sermons website:
Read the history to know that yesterday’s Jews are evil predecessors and today’s Jews are worse successors. They an ingrate people, they altered God’s words, worshipped calf, killed Messengers and denied their Messages. They are exiled people and the worst of mankind. Allaah cursed them and cast His wrath upon them. He turned some of them to monkeys and pigs and worshippers of creatures. They are worst in position and are astray from the right path.
History of Jews is full of deception, trickery, rebellion, oppression, evil and corruption. They always seek to cause mischief on the earth and Allaah loves not the mischief-makers. ... Sudais has made no secret of his support of Hamas. In another sermon (recorded on the al-Haramain Sermons site), he praised the Hamas leader Ahmed Yassin, after he was killed by the IDF, as a “martyr” and exhorted “blessed Jihaad”...
On Wednesday Sudais led prayers at the al-Tawhid Mosque in Leyton. On Thursday he addressed a meeting in Banbury Town Hall. Conservative MP Tony Baldry was a fellow speaker. Yesterday he spoke at the Green Lane Mosque in Birmingham. Next Tuesday he will lead prayers at the East London Mosque.
As you can see, Sudais’ itinerary is studded with a number of prominent British mosques and Islamic centres all eager to play the fawning host to this scion of the Saudi-Wahhabi establishment. None of this is overtly surprising. In fact the Islamist sclerosis within certain parts of the British muslim community has now passed into such an advanced stage that the admission of a Saudi hate-preacher almost goes unnoticed. After all, this is is not the first time the East London Mosque (ELM) has hosted a senior Saudi cleric who also happen to be an exponent of sectarian bigotry. Only a few months ago the ELM welcomed Sheikh Adil al-Kalbani whose anti-Shia and anti-semitic statements were met with worldwide condemnation...
http://www.spittoon.org/archives/2061