Will britain become the new pakistan within the next 30 years ?

I work in a area where there is a large number of pakistani`s we all get on well , thing`s get said to each other in a joking kind of way . But yesterday one of them said that the way things are going within the next 30 years english people will be the minority in this country and britain will become the new pakistan ? i have heard rumors that when 1 person go`s to visit pakistan alone ,they take a load of childrens pports with them ,then when they return to briton they bring their relatives children back with them , i have whitnessed this happen at least 3 times in the last 5 years , you see i work for a large taxi company and i am responsible for the booking of the mini buses etc so i know how many people go and how many return so they may be some truth in what they where saying about it becoming the new pakistan ?