Some countries have laws for that tho, which were implemented precisely so that all business are not allowed to think themselves as so "special" that they can set any rules whatsoever, they've done it in the past and it was ugly. If I make a mining startup can I say it's not a normal job, this you go back home once a week, work 14hrs day and can bring your child as a mini-employee?

I'd be curious as to what work laws in UK says.