Wait until Brexit happens in your FM20 save.
Open FMSE20, load your game.
Go to Nations tab and search for England.
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Double-click on England and go to Agreements tab.
Add the 2 Agreements as shown in the screenshot below.
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Start dates are not important, you can leave whatever is the default.
Save.
Open FMSE20, load your game.
Go to Nations tab and search for England.

Double-click on England and go to Agreements tab.
Add the 2 Agreements as shown in the screenshot below.

Start dates are not important, you can leave whatever is the default.
Save.
