OK - as I explained I am fairly new to this Directing business. However, my reading of Law 27C is that if there is a premature replacement the Director shall take the bid back to the IB (in this case 3C, which I did, and which was not accepted by ops) and then if that IB is not accepted, the substitution (in this case the 4C bid) stands. The Director applies the relevant foregoing section to the substitution.