Large Veuve Clicquot Champagne Bottles in John Lewis Food Hall

I was in John Lewis in Oxford Street the other day, where they have a John Lewis Food Hall (not a Waitrose, as is more usual) in the basement.  They have a pretty good wine department there but what really intrigued me was these three big bottles of Veuve Clicquot.  When I was younger I had one of those big book of facts type books which contained things like paper sizes and, apposite to this post, large Champagne bottle names.  

Now of course I am familiar with and have had magnums and jeroboams but I think this is the first time I have actually seen some of the "Biblical" large sized bottles before.  They had a Methuselah (eight bottles) for £575, a Salmanazar (12 bottles for £750  and a Nebuchadnezzar (20 bottles for £1400).  Now, of course, the equivalent price per bottle (£70 for the Nebuchadnezzar which is nearly double what Waitrose charge for a single bottle) certainly doesn't provide a bulk discount; in fact you pay far more for the privilege of having such a conversation piece.

Certainly, if I was going to drop £1400 on a bottle of Champagne I wouldn't buy one which had been stored in a hot store, upright and under bright lights.  I stopped drinking Veuve Clicquot because there was a period, a few years ago, when they were selling it with insufficient cellaring time.  I gather it is better now, so maybe I should get one for Christmas.  Not one this big, though.  How would you chill it?  You'd have to put it in a bath full of ice, I suppose, or a dustbin.  Not very elegant ,though.  I suppose if you have seven of them there would be enough to give a lady a bath in it.