Its a shame they have been misused. When i woeked in the NHS, we had quite a few qualified people who didn't want set hours or amounts of work. One lady i remember well used to spend time in Hong Kong with her husband. Every time you were re employed with the NHS, at the time, you had to have new CRB, new induction, new occy health process yadda yadda. It took up too much time. having these folk on zero hours contracts meant that they could phone us and ask if they were wanted and we could phone them and offer them work at shortish notice. It worked very well.