Re Hatton Garden Metals, I visited their premises two years back when in London. They have an area where you can buy metals over the counter. It's situated a ten minute walk away from Farringdon tube station. It was a strange experience because the area is chocker with multi-million pound businesses but seemed a little run down and a tad seedy. A surprise came when happening upon an outdoor market along one street that had white stallholders all with cor blimey accents. Inside HGM, one punter before me appeared a bit skint clutching his two carrier bags. To the amazement of everyone they contained £130K cash which he exchanged for the shiny stuff.