Also, the FTSE 100 is somewhat diverse, but you might also consider the MSCI World ETF. I'm in a similar situation to yourself, in that Vanguard sell exactly what I want to buy, but I'm not based in the US - so I just roll up cash for a month or two, then buy another batch of MSCI World. Not as good as having it automated, and not quite as cheap, but still a pretty good way to invest, and at least the broker's fee is a once-off.