"If this appeal turned exclusively – and in my judgment it does not – on the true meaning and effect of the documentation of March 1989, then I would hold as a matter of construction that no obligation on the C.E.G.B. to provide casual work, nor on Mrs Leese and Mrs Carmichael to undertake it, was imposed. There would therefore be an absence of that irreducible minimum of mutual obligation necessary to create a contract of service (Nethermere (St Neots) Ltd. v Gardiner[1984] ICR 612 , 623C-G per Stephenson LJ and Clark v Oxfordshire Health Authority[1998] IRLR 125 , 128 per Sir Christopher Slade, at para 22)." and at p. 1235, Lord Hoffman said : "
"On the findings of the industrial tribunal, the authority was at no relevant time under any obligation to offer the applicant work nor was she under any obligation to accept it. I would, for my part, accept that the mutual obligations required to found a global contract of employment need not necessarily and in every case consist of obligations to provide and perform work. To take one obvious example, an obligation by one party to accept and do work if offered and (our emphasis) an obligation on the other party to pay a retainer during such periods as work was not offered would in my opinion, be likely to suffice. In my judgment, however, as I have already indicated, the authorities require us to hold that some mutuality of obligation is required to found a global contract of employment."