Many Poles have left the city for the suburbs
The same is true of London, for the original Polish immigrants.
I am the last of my family not to have moved out.
The more recent immigrants came into the old Polish strongholds of Acton and Ealing ( or in a Polish accent Aktonn and Ealink) but because of rental and property prices have now moved further out to Greenford.Which is now almost completely Polish.