Just to point out to people who may not be aware, this leaves you open to currency risk. The FTSE 100 dropped 3% in GBP terms last week, but maybe 10% in USD terms.
This cuts both ways of course: you can make money on favourable currency moves. But it's an important risk to be aware of before buying assets in a foreign currency.
Eventually most people have to redeem their investments, though, and they're going to do so in their home currency.
A US investor who bought foreign assets in 2014 and sold them today would have been hurt by the 25% USD/EUR rally in 2014-2015. The dollar rose against almost all other currencies too (besides, for example the yen).
I moved my all of my UK pension to non-UK bonds (mainly US) one day before the referendum result. It was a mission and a half using my pension fund's online system, truly awful UX, I almost gave up.
I don't normally change the holdings or attempt active investing, but it just seemed like a very asymmetric bet - nearly 50/50 polls, very large potential downside if not diversifying outside the UK/sterling.
This cuts both ways of course: you can make money on favourable currency moves. But it's an important risk to be aware of before buying assets in a foreign currency.