Just announced today, new legislation being brought in to make the service providers like Just Eat liable to check the entitlement to work in the UK status of it's workers, even those who are supposedly self employed. About time too. Not only will this flush out the bad employers who turn a blind eye to illegal workers, it may also flush out workers and "employers" throughout the black economy who've been allowed to hide under "fake" self employment in the so-called "gig" economy for the last two or three decades.
https://www.gov.uk/government/news/crackdown-on-illegal-working-and-rogue-employers-in-gig-economy#:~:text=Companies%20hiring%20people%20in%20the,in%20line%20with%20other%20employers.
Bring it on. Let's hope that there's more of this as the black economy, money laundering, tax evasion and benefit fraud needs strong challenge and action - let's add in to that those absent fathers who are avoiding their child maintenance obligations by working "cash in hand" etc.