Ideally you're looking to do a carry trade on sterling versus the yuan, which is popular with fx dealers currently. (This captures spot rate rises and fixed interest). The only way you can access these unless you're confident enough to paly the futures market are through ETFs or ETNs. ETFS has a growing number of these (unsure of a yuan-denominated one) products and are planning to launch more in the emerging market space later this year, as Is Deutsche Bank who have two ETNs. But as with everything, read the small print and I'd avoid it altogether. All other ETF-type currency products are based in the US and while you can access them (Wisdom Tree, Rydex) y9ou are know taking on dollar risk (since you have to pay in dollars) and you'll need to hedge that risk.
In short, I wouldn't bother