The Pimlico Plumbers ruling means that withholding holiday pay from umbrella workers that is theirs can now no longer happen in law and they will be able to claim what is rightfully owed to them:

https://www2.staffingindustry.com/eng/Editorial/Daily-News/UK-Ruling-in-Pimlico-Plumbers-case-could-have-financial-impact-on-other-businesses-60512