My earliest school-friend is half-Polish, she remains close. Another close friend's father was a Polish airman who fought on our side in WW2. I was at Uni., and friends with, 2 Polish girls who had to speak Polish at home for their fathers. Eventually I learnt a few words of Polish from a neighbour with whose son my daughter played.
The Poles constituted one of the waves of immigrants which we received in the Bradford area. They never gave any trouble, learned English and were assimilated. Of course they held onto their culture. There were Saturday-morning schools when the children would learn traditional rhymes etc..
I find nothing at all wrong with that, they caused scarcely a ripple and added to the local culture.
I do not now live in an area which is finding problems, but yet again it seems that is a question of numbers. Too many at the same time in one place. It is a result of uncontrolled immigration. The solution is obvious i.m.o. - leave the E.U..