well i am astonished that a socialist could write what you have written against all the evidence ,though not suprised. my only explanation could be that you are based up north(??) and i in the cowboys overheated south.
1)you are being very nieve here. i have given you evidence re the public sector manuals, others have spoke of construction and building and others of cleaning and agriculture. it is across many sectors and is significant. TBH if it was not, it would not be happenning. little england does not want foreigners here unless the put money in his pocket.
2) this i find frankly very strange that a socialist can suggest that an economic phenomena is NOT systemic .. are you suggestting that somehow immigration is OUTSIDE of the dominant economic system??? this makes no sense at all especially in terms of marxism
3) there is NO general consensus as you state. this is the lie that is being used to justify the process that is clearly unpopular with the vast majority. ( and you know that

There are some skill shortages in the overheating south but the solution to this is surely training our youth! No? and also for what are these projects .. usually bullshit vanity and PFI bullshit .. not what we need or want ...
most immigration is being used in unskilled areas sadly often by people who are very skilled and in their homke countries are desperately missed.
immigration is simply being used to save on training ..
your last paragraph is the capitalist dream ... and it relies on a compliant low wage work force ..