Massive numbers of immigrants always change the culture of their new home. People have argued against all the waves that have hit America would change the culture and each time they were actually right. Some of the changes were for the good such as new foods, and many were not. The problem unique to the waves of immigrants arriving in Britain is the percentage of Muslims. Despite a rather tolerant attitude toward religion on the part of the British, the new waves are not tolerant in return. They are viral in their aggressiveness and will attempt to change more then the eating habits of the British. They will not stop until they have turned Britain into the same sort of counties that they have fled, Islamic and intolerant.
Large-scale immigration to Britain has been continuing throughout the last 50 years. Over that period as a whole, the percentage of Muslims is not nearly as high as tends to be assumed on this forum. Yes, there are plenty of Muslims: but there have always been large numbers from countries where there are few or no Muslims, including those with vigorous Christianity; and from cultures (such as Hindu or Sikh) with long experience of dealing with threatened Muslim hegemony. For that reason the growth in Muslim influence, or indeed control, is nothing like as inevitable as Freepers tend to suppose.