Relationship between D and TF that makes it proper for D to pay
(split in two parts - Part 1)
Control test - who has right to control actions of TF - Yewen v Noakes
Integration test - difference between contract of service (employee = liable) and contract for services (independent contractor = not liable) - S,J,H v M,E
Economic test - looks at money - Ready Mixed Concrete
Two employees could share responsibility - Viasystems
No liability for independent contractors - Barclays