UK, Ireland / where are the poles in london [9]

i need a friend, where are the populated areas for Polish in London.
clapham

Real Estate / Where to buy property in Warsaw, particular for reconstructions/development [2]

Can any one advice on where to search for Real Estate,apartment, and flats
that are for sale in warszawa.

I am mostly looking for apartments and flats that are in need of lots of reconstructions/development.
i do feel there are certain level of property within such areas "Wola, Mokotow, Srodmiescie"
as my research contunites, but my question is how do i get hold of one for sale.
what are the correct local Authority procedures

thanks for you advice.