Thanks for the clarifications folks. 
I think with these two the reason is that they reeeeeeeeally need the money (duh), and it has since been brought to my attention that this was not the first time they had rocked up to work shitfaced. When they eventually came to work on Friday, they were pretty fucked too…but I was not the official supervisor on that day and had little to do with them, so I didn’t much feel like playing the tattletale role. They were seriously pushing their luck though. :rolleyes:
It’s a good thing that they are working, and if this work keeps them from doing ‘street work’ to keep their habits going, I’d rather say nothing further to the boss.
But if they arrive ON MY SHIFT snivelling and scratching and slurring their words like they did last Sunday, I will send them home again.