In 1700 England, Scotland and Ireland were separate countries so this is what this mod does, make them separate countries.
1.Download the attached file
3.Starpos.esf goes to [...]\empire total war\data\campaigns\DMUC_Cmain
4.The other two files goes to [...]\empire total war\data\
5.Add "mod EnglishFlag.pack;" (without the " ") to the top of the script of the custom campaign
6.Now just start Start a custom campaign
Spoiler Alert, click show to read:
obs: Okmin made the flags