I can get hold of the purest of London clay dug from the many ongoing basements digs in central London.This would be the perfect material. I could definitively pull some strings to get it there for next to nothing. As long as there is head room to tip inside the warehouse because tipping outside and moving it in will add cost, the biggest expense then would be the mini diggers and labour needed to deal with it all and the eventual clearance cost when your Family decide they want the space back!
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