You also have to look at where a lot of funding comes from,but certain parties do not to offend the Saudi's

http://www.independent.co.uk/news/uk/home-news/wahhabism-a-deadly-scripture-398516.html

King Abdullah's Saudi regime spends billions of pounds each year promoting Wahhabism, one of fundamentalist Islam's most extreme movements. Much of it funds children's education in British faith schools and mosques. Should we be worried? Paul Vallely investigates