“40) Firstly, the key question is whether there is, to a sufficient degree, a contractual right of control over the worker. The key question is not whether in practice the worker has day to day control of his own work. 41) It has often been observed that in modern conditions many workers - especially the professional and skilled - have very substantial autonomy in the work they do, yet they are still employees. But this has, I think, always been the case. There have always been great houses and estates left for long periods in the practical care and stewardship of servants while the owners and masters have been away. The fact that these servants have been left in charge has never prevented the law - and the parties - from regarding them as being retained under contracts of service. There would be no doubt that the owners retained the right to step in and give instructions concerning what was, after all, their property. It does not follow that, because an absentee master has entrusted day to day control to such retainers, he has divested himself of the contractual right to give instructions to them. 42) Secondly, all aspects of control are relevant to this question. It was once thought that for a contract of employment to exist the master must be empowered to direct not only what is to be done but also the manner in which it is to be done. But many kinds of employee - such as the surgeon, the captain and the footballer discussed by Somervell LJ in Cassidy v Ministry of Health[1951] 1 All ER 574 at 579 - are engaged to exercise their own judgment as to how their work should be done. 43) Thirdly, the starting point lies in the express terms of the contract between employer and employee. If the express terms of the contract do not expressly provide which party shall have the right, the question must be answered in the ordinary way by implication. 44) I would add, from Autoclenz, one further point. Lord Clarke said (paragraph 19): “If a contractual right, as for example a right to substitute, exists, it does not matter that it is not used. It does not follow from the fact that a term is not enforced that such a term is not part of the agreement.” 45) In my judgment what was required was to analyse the terms of the agreement between the parties to see whether, expressly or by implication, Troutbeck - in practice Miss Ibru - retained a right of control to a sufficient degree. I do not think this process is really to be found in paragraphs 48 to 50 of the ET's reasons. Moreover, for the reasons I have given, it is not inconsistent with the concept of employment for an absentee owner to want someone to be responsible for maintaining and managing their property. The question is not by whom day to day control was exercised but with whom and to what extent the ultimate right to control resided. I therefore conclude that the ET's approach was wrong in law.”