For those who need an illustration of what is happening in the UK I suggest that you try to see Ken Loach's film " I am Daniel Blake " which is based upon a true story. It is about a blue collar worker who suffers from heart disease and is unable to work. Despite being provided with a letter from his specialist he is unable to claim benefits. The film documents the trials and tribulations of his attempts to get benefits the eventual outcome is his death from a heart attack.
I agree with Trisher's post. Back in the thirties dockers and labourers would turn up at an agreed rendezvous and would wait to be selected by the gang masters. Many were not but they would turn up day after day.
To think that London, or anywhere else for that matter, does not belong to any one demographic