Immigration doesn't harm "British workers". Plenty of reputable studies show that. What is interesting how those who claim it does don't seem to be as worked up about the actual policies which do, such as a lack of worker's rights. In fact many support them.
https://www.theguardian.com/commentisfree/article/2024/aug/18/defending-working-class-interests-requires-more-than-simply-opposing-immigration