I don't know why you are getting downvoted. Worker protections like guaranteed holidays and unlimited sick days might be the first things to go "to remain more competitive", which is an obvious BS. The same with environment protections - someone made an argument to me, saying that EU is bad because it stops UK from fishing certain types of fish in the north sea......yeah, of course it does, because we were overfishing massively and in a decade there would be none left. Even if UK leaves EU that won't change - it's not like you can magically ignore environmental regulations when you are not part of EU, especially if we are talking about international waters.