Found a couple ProShares Ultra Silver ETF (AGQ), ProShares UltraShort Silver ETF (ZSL), ETFS Leveraged Silver ETF (LSIL-LSE)listed on the British London Stock Exchange
I trade the AGQ when I think silver will move up. It's great, but no market orders, thin on the level II. So if you are wrong, you will take a beating. They will dance around and fill your limit though, nice stock. Good entries and patience and it will move hard. Silver is nice and jumpy intraday.