There are companies like Sport Direct that virtually operate exclusively on zero rated contracts. They may be suitable for casual workers but should be properly regulated. They deprive workers of all the benefits that full time employees accrue. No holiday pay, no workers rights and no pension accruals. People working on these contracts will become a bigger financial burden on the state in the future. These contracts are totally bias towards the employer
In the financial institution that I worked in about 10% were agency contracts. Many had been there for a number of years. Saves the company from all the associated costs with employment.