Better together or better apart? The question hung over Great Britain Thursday as Scots headed to the polls in a historical referendum that will decide if Scotland break ties with the United Kingdom and becomes independent for the first time in 307 years. While the official results won't be announced until Thursday evening at the earliest, some of the refendum's most vocal supporters and non-supporters have already voted.

Scotland's First Minister Alex Salmond, a known advocate for the split, was photographed entering a polling station in Strichen, Scotland Thursday. In Edinburgh, Former Chancellor of the Exchequer and Better Together campaign leader Alistair Darling and his wife Maggie were also seen leaving the polls after participating in the historic referendum.

Voters will answer a simple “Yes” or “No” question when they cast their ballot: “Should Scotland be an independent country?” Some turnout projections are as high as 90 percent, which would be a record for any referendum in the U.K. 

Voting got underway at 7 a.m. local time (2 a.m. EDT) and the polls close at 10 p.m. local time (5 p.m. EDT.)