UK based.
I work as a security guard, currently for night shifts starting midnight to 8:30am. The job application was for part time (24 hours) but found on the interview that each shift includeds 30 minutes unpaid breaks (20 minutes according to my contract). The security manager had me working full time (over 42 hours a week) and said he would increase my hourly rate for doing the night shift, and that my contract would change from part time to full time. I was neither paid more nor had my contract changed, so because I was over working on a part time (seasonal) contract, my head manager refused sick pay. Even when I requested time off to grieve the loss of a family member, both managers barely bat an eyelid. Their excuse was “we have a small budget for security, we'd have to hire contractors” and “we're trying to run a business”. I've gotten tired of their excuses, so I have handed in my weeks notice.
tl;dr I quit my job after being overworked and refused sick pay.