The Great Betrayal.

An imam preaching in a West Midlands mosque acted as a recruiter for Islamic State and told Muslims to “be ready to spill blood” and “establish the law of Allah over the necks of the people” including the Queen, a court has heard.^[1]

Was there a Muslim presence in Britain right after WWII? No. But sometime after that some British traitors woke up and said to themselves, "You know. What Britain really needs is a lot of Muslims. In fact, what we need is boatloads of foreigners of every color and if they're positively hostile to our way of life, why, so much the better."

We tell you time and time again but you never believe us.

Notes
^[1] "UK Imam Tells Congregation to ‘Spill Blood’ and ‘Establish Law of Allah.’" By Liam Deacon, Breitbart, 9/12/17.