Some Sexual Transmitted Infections and Sexually Transmitted Diseases as well, can be spread without knowledge because some people wont know they have one, especially if they show no symptoms....
It has not influenced England at all other than people feeling despair and disdain for the terrorism that has been inflicted on England from so-called Islamic fanatics.
Islam is a state religion by constitution and no law can be formed which is against the guidelines of Islam as per constitution. But ground situation is pretty different. Muslims are in majority