Lukasz:
as I remeber few years ago doctors were trying to go to some wester country and work in factory ... it seems that it is the past :)
You're right, Polish people are working in professions, Dentists, Doctors, Engineers and so on, those are the kind of people the UK can't aford to lose (no offence to those in the lower end jobs) and judging by the salaries in Poland I dont think a Polish GP or Dentist being paid £45,000 + a year (in the UK) is in any hurry to go back to Poland just yet.
I can only sumise the reason for the mass exodus is the drop in the £ and the risk of coming to a country with a shaky economy!