Tiny numbers of them helped build stuff, true, as contracted labour by British engineers and industrialists. I worked in other countries for long spells myself in the 80s and 90s, for money, but I don't claim to have built those countries. What I am totally opposed to is the modern lie that Britain was almost entirely built by foreigners whilst the useless British did nowt. You will read elsewhere on this forum that the rebuilding of Britain after Ww2 was all done by immigrants, yet you cannot find these people in official population records, in any significant number.
Helped, in small numbers.