I have always used the current boundary of East Lothian to differentiate between East Lothian records and records from outwith East Lothian.
However, I was informed that biological records use the Vice County areas. This was a system that was devised in the 1870s by a botanist, dividing Britain into 113 roughly equal sized areas based on the old counties. These areas remain the same, despite more recent changes in county boundaries, so biological records are measured consistently.
|Vice County 82 - East Lothian|
|The current boundary for East Lothian|