Pop your slow cooker on low.
Break up the chocolate bars and place in the crockpot.
Add the condensed milk, orange extract and butter to the pot.
Put the lid on for 30 minutes stirring every 10-15 minutes and then take the lid off for the reamining hour and keep stirring regulary.
Line an 8 inch square tin with baking parchment paper. Alternatively you can use ice cube silicone moulds. Pop the fudge mixture into the tin or moulds and leave to cool for 10 minutes.
After 10 minutes at room temperture press the Terry's chocolate orange segments into the fudge mixture and place into the fridge for about 2- 4 hours or even overnight before you cut.
Cut into squares and enjoy!