Sorry, not madness, but I couldn't resist this fully accurate description
http://www.ebay.co.uk/itm/7mm-scale-for-O-gauge-Pile-of-junk-for-the-corner-of-the-layout-/311306752883?pt=LH_DefaultDomain_3&hash=item487b541373
Described as 'used' but then it would have to be, wouldn't it ?