You do realize that according to this the population has only gone (adding natural and net miggration together) up by 5million between 2003-04 and 2013-14 don't you?

You seem to be extrapolating current trends into a place in the future where your grandchildren will be affected; yet these immigration trends have been occurring for a relatively short period (10 years at most). The only constant is change, and undoubtedly immigration and emigration numbers will alter again in future.

It is quite possible that Africa will become a self-sufficient continent within the next 20 years. Much of Asia already is self sufficient, and growth there will continue in all probability. And it's a very long way from Indonesia to Dover, so I wouldn't worry unduly about that scenario.

Ethnic groups tend to find ways to get along over time. Green Lanes in north London is one of the few places in the world where Greeks and Turks live side-by-side with little or no friction. And it's only ever a tiny minority from any religious group who use their beliefs to beat up others. Most want the same things that you do, a peaceful happy life and a good future for their families.

Ultimately.

We must remember that each wave of migrants, and they will be continuous with world population increase and displacement, will have several children each. Most likely more than the average. Even if that trend slows for one wave of migrants, there will be another right behind them. The population will sharply increase year on year and an ever increasing proportion of them will be migrants.
Aside from considerations about housing and services, we must also consider the impact that it will have on our democratic system. We risk our elections being dominated by identity politics and minority issues.

The basic point all you water based analogies are missing are that the majority of immigration we are in control of. If we are on a sinking ship with more water gushing in then you have to ask yourself why the captain of the ship has opened the bow doors to let in twice a much water ( 1 third uncontrolled immigration two thirds controlled immigration over the last ten years) but it is not only this Captain that has been willfully negligent it is his five predecessors, that have all had higher 'controlled' immigration' then 'uncontrolled'. We are in control, it is less force nine on the north Alantic and more the Elephant and Castle swimming pool wave machine, we can shut it off when we want.
It's curios almost like immigrants bring skills we need and want. The reason we need and want those skills is whole different arguement

I think the ship is not being controlled by the captain but by some people in Brussels. In other words, we do not have control over economic migration to our own country. I will be interested to see if we leave the EU and then if government still dances to the tune of business or actually cuts European immigration as the majority of the population want.

I think the ship is not being controlled by the captain but by some people in Brussels. In other words, we do not have control over economic migration to our own country. I will be interested to see if we leave the EU and then if government still dances to the tune of business or actually cuts European immigration as the majority of the population want.