I used the word conditions because the word rights gets everyone hot under the collar (blue or white).
The UK living wage is higher than the EU average. The UK maternity leave is more than the EU stipulation. The UK annual paid holiday is more than the EU stipulates. The Working Time Directive is specifically implemented in UK law.
So I don’t really see why we need the EU to guarantee working conditions. Outside the EU I’m sure we can continue doing better and better for our workers.