[PeachPlum]

That's the thing about referenda, if you want to have a say in the outcome, you have to cast your vote, not sit at home

Presented to Parliament by the Secretary of State for Foreign and Commonwealth Affairs by Command of Her Majesty, February 2016

2.1 The result of the referendum on the UK’s membership of the European Union will be final.

[ZeroGravitas]

There is a key difference betwen "this is the will of the people" and "this is the will of the people that we allowed to vote, and who found the time to make it along on the day".

People aged 16-18 and people living abroad are two groups that had no option but to sit at home and are both considered anti-Brexit.

[MarkCole]

British Expats living abroad were allowed to vote. As long as you lived in the UK within the last 15 years you can vote in Elections and Referendums.