Alisvolatpropiis - Minimum wage and living wage are not the same. it's very hard to survive (especially with kids!) on minimum wage even working 40 hrs a week.
I used to work as a pizza delivery driver back when i was childless. Most folk round up, i tended to get better tips in worse off areas and if the weather was bad (i was on one of those awful moped with a pizza box on the back). I will go out of my way to scrape a tip together when i order a takeaway unless there's already a delivery charge in which case it's about what i've got in my pockets.
Once i delivered to a large office block about 9.30pm, winter, Glasgow. I had to wait 10 minutes to get into the building and another 15mins waiting for the guy who'd ordered the pizza to actually come down (he hadn't given any details of which floor/company he was with). The pizza was 18.99 and he paid me a £20 note and said something like "that's fine" which i (foolishly) took to mean 'keep the change' - this being an occurrence on about 80% of deliveries I'd been on.
After a moment of staring at me he asked where his change was and glared at me as i fumbled numb-fingered through the float to give him his £1.01 change after he'd cost me 25minutes (the company i was delivering for have a 30 minute target for all drops - you expect to make that your average quite easily). He made some comment to the security guard that implied i was trying to rip him off.
After the suited and booted pizza ordering guy disappeared back into the lift with his pizza the security guard actually apologised to me for it, and ranted a wee bit about how rude he'd been, which was nice.
I don't begrudge him the £1.01 but it really struck me at the time how rude and selfish his actions seemed, especially given how much of my time he'd wasted.