My grandmother came to the US in 1927. She never mastered English and partially forgot her Yiddish and Polish, so spoke a heavily accented hybrid English. But she loved America and married a man who came from Lithuania as a baby and spoke not a word of any language other than English. He became wealthy “by his bootstraps,” and his factory/warehouse/store on Broadway in Buffalo employed a couple hundred people. Was my grandmother a “third-world parasite”? She worked in a sweatshop and married well, and loved America, adopting American values and knowing how to live cheap from her years growing up in a shtetel hovel.
You may not want non-English speakers in the UK, but don’t go smearing a whole category of people. Those who come from the third world might or not speak English, but those who come to do honest work and who love their new country and support it are an asset. And generally, Poles, whether Jewish or gentile, have a good history as immigrants. They are not “parasites” imho.
Not only are Polish immigrants to the UK not ‘parasites’: one little-remarked consequence of the influx of large numbers of mostly young, mostly male Poles in the UK, practising Catholics almost to a man, has been the revitalisation of many moribund Catholic congregations, which had been reduced to the usual Western European caricature of a few elderly widows.