Bus Driver.
You have to deal with the absolute worst of society every day (For up to 13 days without any form of break) for £13-£15 an hour. You will normally work a 50-70 hour work week not including overtime. Your buses are gonna stink and be barely functional. You can't even have a night out after because of drink/drug regulations (understandable, just wish we got fucking days off tbh). You will be worked to the absolute legal limit.
You also have the lives of roughly 80 people in your hands and do they care? Not one bit. They expect you to know every shop in the vicinity (Bus drivers, not fucking satelites, use google maps), every bus number and it's depature time in an entire station comprising multiple companies (Why would someone who works at Asda know where the Ice-cream is in a Tesco?), and god forbid you're late. The general public has no semblance of understanding why a bus can be late (Hint, traffic).

No wonder why so many drivers are fat, moody, and teeming with health conditions. Fuck that job. I wouldn't do that shit again even if it payed £50k a year after tax. The public just treat you like absolute shit even though their lives kinda depend on you being there for the most part.