Sequin you say "You can't seriously oppose other people coming to the same country you did looking for opportunities to better themselves just as you did 10, 20 or 30 years ago."- well, yes you can, and are maybe more likely to do so if you arrived with nothing, were given practically nothing yet worked your way 'up' to a position of relative affluence, well-settled, proper tax paying but contributing, not taking; then see 'incomers' arrive who threaten to 'take away', to push you further down a queue, because yes, I believe you'd have every reason to feel 'entitled'. You entered into a social contact: I'll work hard, I'll pay my way, I'll contribute to this country financially and socially- the trade off being, when and if my time of need comes, there's be some pay out for me.
I will wonder how much 'it will jar' with you when and if you ever found yourself trying to find another primary school for your DC because the local one was suddenly full of unplanned-for incomers, or (and whispers here)- your DC was one of only 2 non-'Eastern European language' speakers in her class... and found herself socially excluded as a result (true documented story- an extreme example, yes, I grant you) BUT the point I am making is that it is the poorer people in more deprived areas who do find themselves 'exposed' by uncontrolled mass-immigration such as a lot of people in Eastleigh and governments ignore their voice at their peril.
As I stated, DH is an immigrant, arriving on an ancestry visa (though he could also have applied on a spousal visa). This cost us £650. Once here, he had 'no recourse to public funds' for 5 years and only emergency access to the NHS (though that was never, ever checked or challenged- it should have been). So if he were unemployed- no dole, no housing, no JSA. In fact, after 3 months in a temp job, he did become unemployed, I had to go back to work (with a 2 year old), to pay the rent for the few weeks before he got the permanent managerial job he's still in! And yes, I'm still working PT.
Since then, 10 years odd ago, DH has done nothing but contribute to the country. He finds our open-door immigration policies completely nuts.
I hold dual citizenship with Australia. To gain this, I had to be on their occupational shortage register (HCP, so yes), have no dependents and be under I think it was 35, and stay in my job!
Yes, we may always need immigrant care workers, spud pickers etc (though questions of our own unemployed potential workforce could be asked!) but I am not sure we are, economically, in a position any more to financial provide for their 'collateral'. This way social unrest lies.