that has been happening for years. You should have a job before coming, not a bogus one, but that can be verified long before arrival, and money in the bank to support themselves, no benefits either for a year or more.
and if anyone watched the London programme with Matt wright last evening, public screening for evidence of TB, as it would seem, and largely borne out by evidence from consultants, doctors, hospitals, that not only is it on the rise in London but it's being brought it from abroad, countries that have high incidences of TB, and this current strain seems far more resistant to medications that were once thought to cure it. This new strain is highly contagious and almost impossible to cure so they said, the financial cost is massive as those who carry it will have to take a huge cocktail of medication for a very long period of time.
It doesn't seem to be just the capital that has this problem either...