Baggs last November a member of the European Parliament petitions committee said
The Commission has made clear that workers employed on zero-hours contracts should have full employment rights as a result of EU law on part-time workers, and that there is a need to investigate the legality of flexi-jobs under EU law...These types of contracts are pernicious. For example, workers’ basic rights are withheld, with no maternity leave, paid holiday or redundancy given. We need to build a Europe-wide picture of precarious employment so we can understand its impact.
That said, after we leave, there's nothing to stop the government changing the law.