Past versions won't work mate... but it's easily done yourself.
In the editor, drop two teams out from the bottom tier of England, then shift two random teams from each league above downwards, then add Rangers and Cetlic into the Premiership. This way, you won't end up chucking two premier league teams completely out the system, just two semi pro BSP teams. This is done very easily by simply going to the teams for this season in the selected league within the editor and removing them/adding them.
Then you will have to change Rangers' & Celtic's locations to an English city, i.e Carlisle, same with the stadiums. Otherwise, it does not work. Unfortunately you won't end up with Scottish players being your majority youth team intake.
Then do the same with Scotland, except move teams up. i.e:
Raith Rovers + Dunfermline ^ SPL
Dumbarton + Alloa ^ Division 1
Peterhead + Elgin ^ Division 2
Then add, for example:
Forres Mechanics + Spartans ^ Division 3
That's if you want it to look more genuine and still have the Scottish leagues as playable of course!
Hope that's clear enough and it helps, sorry if it doesn't.