Top link this is, Convex. Now there's a surprise, Ed & David Milliband have Polish roots, i'm totally gobsmacked. Chances are in 4yrs time we'll have a Polish PM!
city/Place in the U.k has the most Polish People
London - Ealing, Hammersmith, Acton, Balham & possibly Slough!
It's tough to know the exact numbers but hopefully after the Census2011 in March you'll get a somewhat legit figure!.