15 stone? might take a few years to fill that order, unless you don't mind a blended mix of PB and P5 quality rust (only the finest British ingredients stocked here you know)
That's almost as much rust that fell out from our windscreen peak when I took a speedbump a little too optimistically just a few weeks after purchasing our Commer
Ours might be more valuable though as it's a complicated amalgam of iron oxide and filler - apparently this 'alloy' is widely desirable and has many uses on Commers