Specifically, I'm interested in the Vanguard High Dividend Yield ETF. I actually live in China and don't plan on returning to the UK for the foreseeable future. Although I have some UK investments, I'd like to spread my risk out a bit more globally.
Vanguard has just recently started listing its funds in London but it doesn't look like the High Dividend Yield ETF is available yet.
You'll need to either get a broker who can trade on the U.S. markets (there might be tax and exchange rate complications), or wait until Vanguard lists this stock on the London exchange.