I'm trying the softly softly approach, to begin with at least. I want to get the sweet bookstore officer on my side and doing her best to help me. I have rung through a few times, but she is not answering her phone. Have left a message to call me, but I will keep trying too. Receptionist told me there is an event going on at St Hill (maybe the big one with DM in attendance, patron's ball etc), and that I will find the bookstore officer on post at 1pm tomorrow, which is 1am tonight NZ time. Hope I can stay awake and alert until then.
Thank you one and all for your advice. It has been very interesting and helpful, but Paul's has been the most apt for the situation. He knows the mindset and culture of St Hill. Sure, the CoS responds to legal threats and threats of bad PR (and it may come to that), and shouting and suing is the American way, quite the norm in that part of the world, but I am dealing with the British culture here, so I shall try this approach first. From my experience, St Hill staff are quite gentle and almost reasonable. Will keep you informed.